v0.318.0: the internal data place, partitions, an honest whole-box backup offer (R-1084), sys_drive never offered (R-1082)

felhom.eu architecture/16 §4-§6 (build B). MinAgent 0.157.0 — the internal place and the partitions appear only when
agent >= 0.158.0 reports them. Tests red-proved; four parity fixtures refreshed (only the new lines).

Claude-Session: https://claude.ai/code/session_012qRErfCoiTkvDK9N5XHbzb

controller/internal/agentapi/client.go

@@ -357,12 +357,16 @@ type DiskInfo struct {
 	Smart *SmartSummary `json:"smart,omitempty"`
 	// Physical-disk identity (agent v0.157.0, `16` §3): kind, the keys of the physical disks under the place,
 	// proven|unknown + reason. Empty from an older agent or for an absent drive.
-	Kind           string   `json:"kind,omitempty"`
+	Kind           string   `json:"kind,omitempty"` // system | internal | disk | partition | network (felhom.eu `16` §3)
 	PhysicalDisks  []string `json:"physical_disks,omitempty"`
 	Identity       string   `json:"identity,omitempty"`
 	IdentityReason string   `json:"identity_reason,omitempty"`
 }
 
+// PlaceKindInternal is the agent's kind for the one-disk box's internal data place („Belső tárhely", agent ≥ 0.158.0,
+// felhom.eu architecture/16 §5): a host mount on the system disk, bound at /mnt/felhom-drives/belso.
+const PlaceKindInternal = "internal"
+
 // FSUUID returns the raw filesystem UUID from a "uuid:<…>" DurableID, or "" if this disk's identity
 // is not a filesystem UUID (network/lvm targets — not assignable as a host mount).
 func (d DiskInfo) FSUUID() string {
@@ -477,8 +481,34 @@ type DiskCandidate struct {
 	// mountpoint — sending it down the device-attach path would try to mount an in-guest path as if
 	// it were a raw device. See web/attach_sources.go for why the agent's scan cannot supply these.
 	AlreadyMounted bool `json:"already_mounted,omitempty"`
+	// Partitions (agent ≥ 0.158.0, felhom.eu architecture/16 §6): each partition of this disk as its own place —
+	// state empty („format this part"), filesystem („use this part" when mountable; format through the confirmed
+	// path), in_use (already a Felhom drive: shown, never offered). Absent from an older agent.
+	Partitions []CandidatePartition `json:"partitions,omitempty"`
+	// WholeDiskInUse is set by the CONTROLLER (never the agent) when a partition of this disk is a registered drive
+	// (R-542): the disk stays listed for its FREE parts only, and no whole-disk action is offered.
+	WholeDiskInUse bool `json:"whole_disk_in_use,omitempty"`
 }
 
+// CandidatePartition mirrors the agent's partition entry (felhom-agent internal/storage/partitions.go).
+type CandidatePartition struct {
+	Device    string `json:"device"`
+	Number    int    `json:"number,omitempty"`
+	SizeBytes int64  `json:"size_bytes"`
+	FSType    string `json:"fstype,omitempty"`
+	State     string `json:"state"` // empty | filesystem | in_use
+	Mountable bool   `json:"mountable"`
+	DurableID string `json:"durable_id,omitempty"` // uuid:<fs-uuid> — the attach key
+	MountedAt string `json:"mounted_at,omitempty"`
+}
+
+// Partition states (agent ≥ 0.158.0).
+const (
+	PartEmpty      = "empty"
+	PartFilesystem = "filesystem"
+	PartInUse      = "in_use"
+)
+
 // CandidatesResult mirrors GET /disks/candidates: disks free to enroll, split into initialize (all
 // unclaimed) and attach (the mountable-FS subset).
 type CandidatesResult struct {

controller/internal/i18n/locales/en.json

@@ -1362,6 +1362,12 @@
   "err.stacks.ellenorzes_sikertelen_mentes": "the check failed (%s backup): %s",
   "err.stacks.field_required": "the %q (%s) field has to be filled in",
   "err.stacks.needs_drive": "This app needs a storage drive. You can add one on the Storage → Drives page.",
+  "storage_wizard.resz_n": "part {n}",
+  "err.web.meghajto_hasznalatban_formazas": "This disk holds a drive that is in use, so the whole disk cannot be formatted. You can format only its free part.",
+  "storage.belso_tarhely_magyarazat": "It is on the machine's own disk, but it is not part of the full system backup. A different disk or the off-site backup protects against a disk failure.",
+  "backup.target.offer_unproven": "You can choose this drive as the place for the system backup. Felhom cannot check that this drive is really a different disk (inside a virtual machine and behind some USB enclosures this is not visible), so we cannot promise that you can restore the system after a disk failure.",
+  "storage.belso_tarhely": "Internal storage",
+  "err.web.belso_tarhely_eletciklus": "The internal storage is on the disk of the machine itself, so it cannot be removed, retired or formatted. You can move its data to another drive.",
   "err.stacks.field_required_password": "the %q field has to be filled in — use the Generate button, or type a password",
   "err.stacks.forras_nevter_olvasasa_sikertelen": "reading the source folder failed: %s",
   "err.stacks.forras_torlese_sikertelen": "removing the source failed (%s): %s",

controller/internal/i18n/locales/hu.json

@@ -1355,6 +1355,12 @@
   "err.stacks.ellenorzes_sikertelen_mentes": "ellenőrzés sikertelen (%s mentés): %s",
   "err.stacks.field_required": "a(z) %q (%s) mező kitöltése kötelező",
   "err.stacks.needs_drive": "Ehhez az alkalmazáshoz egy adattároló kell. A Meghajtók oldalon adhatsz hozzá egyet.",
+  "storage_wizard.resz_n": "{n}. rész",
+  "err.web.meghajto_hasznalatban_formazas": "Ezen a lemezen egy használatban lévő meghajtó van, ezért a teljes lemez nem formázható. Csak a szabad részét formázhatod.",
+  "storage.belso_tarhely_magyarazat": "A gép saját lemezén van, de nem része a teljes rendszermentésnek. Egy lemezhiba ellen egy másik lemez vagy a távoli mentés véd.",
+  "backup.target.offer_unproven": "Ezt a meghajtót kijelölheted a rendszermentés helyéül. A Felhom nem tudja ellenőrizni, hogy ez a meghajtó valóban másik lemez-e (virtuális gépben és egyes USB-házakban ez nem látszik), ezért nem ígérhetjük, hogy egy lemezhiba után is vissza tudod állítani a rendszert.",
+  "storage.belso_tarhely": "Belső tárhely",
+  "err.web.belso_tarhely_eletciklus": "A Belső tárhely a gép saját lemezén van, ezért nem lehet leválasztani, leszerelni vagy formázni. Az adatait áthelyezheted egy másik meghajtóra.",
   "err.stacks.field_required_password": "a(z) %q mező kitöltése kötelező — használd a Generálás gombot vagy írj be egy jelszót",
   "err.stacks.forras_nevter_olvasasa_sikertelen": "forrás névtér olvasása sikertelen: %s",
   "err.stacks.forras_torlese_sikertelen": "forrás törlése sikertelen (%s): %s",

controller/internal/settings/settings.go

@@ -563,6 +563,11 @@ type CrossDriveBackup struct {
 const (
 	StorageKindDrive   = "drive"
 	StorageKindNetwork = "network"
+	// StorageKindInternal (v0.318.0, felhom.eu architecture/16 §5) is the one-disk box's internal data place
+	// („Belső tárhely"): a volume on the SYSTEM disk the agent mounts like a drive. Apps and their data live there;
+	// the drive lifecycle that would remove or format it (eject, decommission, wipe) does not apply — moving its data
+	// to another drive does.
+	StorageKindInternal = "internal"
 )
 
 // NetworkMountRoot is the in-guest path under which the agent propagates NAS shares (mirrors the agent's
@@ -635,6 +640,9 @@ type StoragePath struct {
 // lifecycle (eject/decommission/migrate/wipe/SMART) must NEVER be applied to a network path.
 func (p StoragePath) IsNetwork() bool { return p.Kind == StorageKindNetwork }
 
+// IsInternal reports whether this is the internal data place (`16` §5).
+func (p StoragePath) IsInternal() bool { return p.Kind == StorageKindInternal }
+
 // NotificationPrefs holds customer notification preferences.
 type NotificationPrefs struct {
 	Email         string   `json:"email,omitempty"`

controller/internal/stacks/d4_needs_drive_test.go

@@ -2,8 +2,13 @@ package stacks
 
 import (
 	"errors"
+	"io"
+	"log"
+	"path/filepath"
 	"strings"
 	"testing"
+
+	"gitea.dooplex.hu/admin/felhom-controller/internal/settings"
 )
 
 // D4 (felhom.eu architecture/16-storage-physical-identity.md §5, R-1068): a data-folder or media app on a
@@ -45,3 +50,33 @@ func TestD4_FilledPathKeepsItsOwnRefusal(t *testing.T) {
 		t.Fatalf("want ErrPathMissing for a filled, missing path, got %v", err)
 	}
 }
+
+// `16` §5 (v0.318.0): on a one-disk box with the internal place registered, a media app installs with NO extra step
+// and NO sentence — its HDD_PATH lands on the internal place. Companion of TestD4_NoDriveRefusalSpeaksInWords (the
+// same app, no drive → the refusal).
+func TestD4_InternalPlaceIsTheMediaAppsDrive(t *testing.T) {
+	m := r553Manager(t, "display_name: Jellyfin\nmedia_library:\n  folder: films\ndeploy_fields:\n  - env_var: HDD_PATH\n    label: Médiatár útvonal\n    type: path\n    required: true\n")
+	sett, err := settings.Load(filepath.Join(t.TempDir(), "settings.json"), log.New(io.Discard, "", 0))
+	if err != nil {
+		t.Fatal(err)
+	}
+	belso := filepath.Join(t.TempDir(), "belso")
+	if err := sett.AddStoragePath(settings.StoragePath{Path: belso, IsDefault: true, Schedulable: true, Kind: settings.StorageKindInternal}); err != nil {
+		t.Fatal(err)
+	}
+	m.settings = sett
+	m.isMountPoint = func(p string) bool { return filepath.Clean(p) == belso }
+	if got := m.defaultMediaDrive(); got != belso {
+		t.Fatalf("the default media drive: want the internal place %q, got %q", belso, got)
+	}
+	// The folder is deliberately NOT created: the deploy then stops at its path check, so no real `docker compose`
+	// can ever start on the machine running this test (tests that reach real docker act on DooPlex, R-650). The
+	// refusal naming the internal place proves HDD_PATH was filled with it — the step the household no longer does.
+	_, err = m.DeployStack(DeployRequest{StackName: "r553app", Values: map[string]string{}})
+	if errors.Is(err, ErrNeedsDrive) {
+		t.Fatalf("a box with the internal place must not be told it needs a drive: %v", err)
+	}
+	if !errors.Is(err, ErrPathMissing) || !strings.Contains(err.Error(), belso) {
+		t.Fatalf("want the media app's HDD_PATH filled with the internal place %q, got %v", belso, err)
+	}
+}

controller/internal/web/agent_disk_handlers.go

@@ -190,6 +190,12 @@ func dropRegisteredDrives(resp agentapi.CandidatesResult, mountsText string, reg
 		out := make([]agentapi.DiskCandidate, 0, len(in))
 		for _, c := range in {
 			if candidateBacksInUse(c, inUse) {
+				// `16` §6 (v0.318.0): a disk whose ONE part is a registered drive keeps its FREE parts on offer —
+				// the whole disk itself, never (WholeDiskInUse; handleStorageInit refuses it server-side too).
+				if free := freePartitions(c.Partitions, inUse); len(free) > 0 {
+					c.Partitions, c.WholeDiskInUse = free, true
+					out = append(out, c)
+				}
 				continue
 			}
 			out = append(out, c)
@@ -201,6 +207,34 @@ func dropRegisteredDrives(resp agentapi.CandidatesResult, mountsText string, reg
 	return resp
 }
 
+// deviceBacksRegistered reports whether formatting `device` would touch a registered drive: the device itself, or a
+// whole disk one of whose parts is registered (the same join as dropRegisteredDrives). FAIL-SAFE: an unreadable mount
+// table cannot prove the device free → true.
+func deviceBacksRegistered(device, mountsText string, registered map[string]bool) bool {
+	if strings.TrimSpace(mountsText) == "" {
+		return true
+	}
+	inUse := map[string]bool{}
+	for _, row := range parseMountTable(mountsText) {
+		if registered[path.Clean(row[1])] && strings.HasPrefix(row[0], "/dev/") {
+			inUse[row[0]] = true
+		}
+	}
+	return candidateBacksInUse(agentapi.DiskCandidate{Device: device}, inUse)
+}
+
+// freePartitions keeps the parts that are not a registered drive and not already Felhom's (state in_use).
+func freePartitions(parts []agentapi.CandidatePartition, inUse map[string]bool) []agentapi.CandidatePartition {
+	var out []agentapi.CandidatePartition
+	for _, p := range parts {
+		if p.State == agentapi.PartInUse || inUse[p.Device] {
+			continue
+		}
+		out = append(out, p)
+	}
+	return out
+}
+
 // candidateBacksInUse reports whether a candidate's disk is a source in inUse: the whole disk itself,
 // its mountable partition, or any partition of it (/dev/sdb1, /dev/nvme0n1p1 under /dev/sdb, /dev/nvme0n1).
 func candidateBacksInUse(c agentapi.DiskCandidate, inUse map[string]bool) bool {

controller/internal/web/attach_sources.go

@@ -143,6 +143,14 @@ func readMountTable() string {
 	return string(b)
 }
 
+// mountTable is readMountTable through the mountsFn test seam (nil → the controller's real /proc/mounts).
+func (s *Server) mountTable() string {
+	if s.mountsFn != nil {
+		return s.mountsFn()
+	}
+	return readMountTable()
+}
+
 // registeredStoragePaths is the set of paths already in the registry, for the exclusion above.
 func (s *Server) registeredStoragePaths() map[string]bool {
 	out := map[string]bool{}
@@ -159,5 +167,41 @@ func (s *Server) registeredStoragePaths() map[string]bool {
 // precondition read, so the picker and the sentence pointing at it cannot disagree — the same
 // single-derivation rule R-252 applied to HasRestoreDestination.
 func (s *Server) attachableStores() []mountedStore {
-	return mountedUnregisteredStores(readMountTable(), s.registeredStoragePaths())
+	return s.attachableStoresFrom(readMountTable())
+}
+
+// attachableStoresFrom is attachableStores for a given mount table (the seam its tests use).
+func (s *Server) attachableStoresFrom(mounts string) []mountedStore {
+	sdp := ""
+	if s.cfg != nil {
+		sdp = s.cfg.Paths.SystemDataPath
+	}
+	return withoutSystemVolume(mountedUnregisteredStores(mounts, s.registeredStoragePaths()), mounts, sdp)
+}
+
+// withoutSystemVolume drops every offered store that lives on the guest's OWN data volume (R-1082, operator ruling
+// 2026-10-16 „hide it now"; felhom.eu architecture/16 §11): /mnt/sys_drive is a folder of that volume, which rides in
+// every whole-box copy, local and off-site — films put there would fill them. Excluded by DEVICE, like the rootfs
+// guard above, so a second bind of the same volume under another /mnt/<name> is hidden too. A box that already
+// REGISTERED sys_drive keeps it: this filters only what is OFFERED. systemDataPath "" falls back to the config
+// default /mnt/sys_drive (fail toward hiding). Pinned by r1082_sysdrive_hidden_test.go.
+func withoutSystemVolume(stores []mountedStore, mountsText, systemDataPath string) []mountedStore {
+	if systemDataPath == "" {
+		systemDataPath = "/mnt/sys_drive"
+	}
+	volumePaths := map[string]bool{path.Clean(systemDataPath): true, "/var/lib/felhom": true, "/var/lib/docker": true}
+	volumeDevices := map[string]bool{}
+	for _, row := range parseMountTable(mountsText) {
+		if volumePaths[path.Clean(row[1])] {
+			volumeDevices[row[0]] = true
+		}
+	}
+	out := stores[:0:0]
+	for _, m := range stores {
+		if volumeDevices[m.Device] || volumePaths[path.Clean(m.Path)] {
+			continue
+		}
+		out = append(out, m)
+	}
+	return out
 }

controller/internal/web/backup_target_offer.go

@@ -37,6 +37,9 @@ type BackupTargetState struct {
 	// was told the backup was on the system disk (false) and offered the drive that just disappeared
 	// (felhom.eu audits/E2D-fresh-vm-2026-07-29.md §5.3).
 	TargetAbsent bool
+	// OfferUnproven (R-1084) marks an offered drive the agent cannot prove is another disk than the system data:
+	// the page then makes no disk-failure promise.
+	OfferUnproven bool
 	// TargetID is the agent's primary tier storage id (e.g. "felhom-backup" / "local").
 	TargetID string
 	// Label is the customer-facing drive name when the target is a real drive.
@@ -95,7 +98,7 @@ func (s *Server) resolveBackupTargetState(ctx context.Context) BackupTargetState
 		// this state must be correct on its own. Belt here, braces there.
 		return st
 	}
-	st.OfferPath, st.OfferLabel = s.firstOfferableDrive(disks.Disks)
+	st.OfferPath, st.OfferLabel, st.OfferUnproven = s.firstOfferableDrive(ctx, disks.Disks)
 	return st
 }
 
@@ -127,20 +130,81 @@ func targetIsConfiguredDrive(targetID string) bool {
 // firstOfferableDrive picks a registered, connected, non-network drive that could hold the backup.
 // It is a SUGGESTION for the offer — the customer still has to choose (E-2 §3). Nothing here assigns
 // anything.
-func (s *Server) firstOfferableDrive(disks []agentapi.DiskInfo) (path, label string) {
+//
+// R-1084 (v0.318.0, felhom.eu architecture/16 §4): the offer promises survival of a DISK failure, so it now asks the
+// agent whether the drive is really another disk than the system data. A proven different disk wins; a drive the
+// agent cannot prove (a VM, a USB bridge that hides the serial) is still offered, but unproven=true makes the page say
+// so in build A's words instead of the promise; a drive on the SAME disk is never offered (a copy there dies with the
+// disk); an agent older than 0.157.0 keeps today's offer. Pinned by r1084_offer_identity_test.go.
+func (s *Server) firstOfferableDrive(ctx context.Context, disks []agentapi.DiskInfo) (path, label string, unproven bool) {
+	fallback, fallbackLabel, fallbackUnproven := "", "", false
 	for _, sp := range s.settings.GetStoragePaths() {
-		if sp.IsNetwork() || sp.Decommissioned || sp.Disconnected {
+		if sp.IsNetwork() || sp.IsInternal() || sp.Decommissioned || sp.Disconnected {
 			continue
 		}
 		for _, d := range disks {
 			// Only a drive the agent classifies as user-data with its OWN mountpoint can be a target;
 			// the agent refuses anything else anyway, so offering it would be a dead end.
-			if d.GuestPath == sp.Path && d.MountPath != "" && d.Role == "user-data" {
-				return sp.Path, s.storageLabelFor(sp.Path)
+			if d.GuestPath != sp.Path || d.MountPath == "" || d.Role != "user-data" {
+				continue
+			}
+			switch s.offerRelationFor(ctx, sp.Path) {
+			case offerDifferent:
+				return sp.Path, s.storageLabelFor(sp.Path), false
+			case offerSame:
+				continue
+			case offerUnknown:
+				if fallback == "" {
+					fallback, fallbackLabel, fallbackUnproven = sp.Path, s.storageLabelFor(sp.Path), true
+				}
+			default: // offerLegacy: today's behaviour
+				if fallback == "" {
+					fallback, fallbackLabel, fallbackUnproven = sp.Path, s.storageLabelFor(sp.Path), false
+				}
 			}
 		}
 	}
-	return "", ""
+	return fallback, fallbackLabel, fallbackUnproven
+}
+
+// offerRelation is the agent's verdict on a candidate backup drive against the system data (R-1084).
+type offerRelation int
+
+const (
+	offerLegacy    offerRelation = iota // the agent cannot judge (older than 0.157.0): today's offer, today's words
+	offerDifferent                      // proven different disks: the disk-failure promise holds
+	offerUnknown                        // not proven (a VM, a hiding USB bridge, or the question failed): no promise
+	offerSame                           // the same physical disk: never offered
+)
+
+// offerRelationFor asks the agent (POST /disks/same-disk) through the sameDiskFn seam (nil → the real client).
+func (s *Server) offerRelationFor(ctx context.Context, drive string) offerRelation {
+	sdp := "/mnt/sys_drive"
+	if s.cfg != nil && s.cfg.Paths.SystemDataPath != "" {
+		sdp = s.cfg.Paths.SystemDataPath
+	}
+	if s.sameDiskFn != nil {
+		return s.sameDiskFn(ctx, drive, sdp)
+	}
+	client, err := s.agentClient()
+	if err != nil {
+		return offerLegacy
+	}
+	if client.Supports(ctx, agentapi.FeatureSameDisk) == agentapi.SupportNo {
+		return offerLegacy
+	}
+	r, err := client.SameDisk(ctx, drive, sdp)
+	switch {
+	case err != nil:
+		s.logger.Printf("[WARN] [backup-target] same-disk question for %s failed: %v — the offer makes no promise", drive, err)
+		return offerUnknown
+	case r.Proven && r.Different:
+		return offerDifferent
+	case r.Proven:
+		return offerSame
+	default:
+		return offerUnknown
+	}
 }
 
 // baseName is path.Base without importing path into this file's surface.
@@ -171,6 +235,9 @@ func baseName(p string) string {
 const (
 	backupTargetDegradedKey = "backup.target.degraded"
 	backupTargetOfferKey    = "backup.target.offer"
+	// backupTargetOfferUnprovenKey (R-1084, v0.318.0): the offer for a drive the agent cannot prove is another disk —
+	// build A's words, no disk-failure promise.
+	backupTargetOfferUnprovenKey = "backup.target.offer_unproven"
 	// backupTargetAbsentText (R-114) is the CONFIGURED-BUT-GONE state. It is VERBATIM the hub's
 	// customerMessages["backup_target_absent"] (felhom.eu hub/internal/notify/templates.go:93) so the
 	// banner a customer reads on the page and the email they receive say exactly the same thing — a
@@ -245,7 +312,11 @@ func (s *Server) backupTargetView(ctx context.Context, lang string) *BackupTarge
 	}
 	v := &BackupTargetView{Message: s.msgLang(lang, key)}
 	if st.OfferPath != "" {
-		v.OfferPath, v.OfferLabel, v.OfferText = st.OfferPath, st.OfferLabel, s.msgLang(lang, backupTargetOfferKey)
+		offerKey := backupTargetOfferKey
+		if st.OfferUnproven {
+			offerKey = backupTargetOfferUnprovenKey // R-1084: no disk-failure promise for an unproven disk
+		}
+		v.OfferPath, v.OfferLabel, v.OfferText = st.OfferPath, st.OfferLabel, s.msgLang(lang, offerKey)
 	}
 	return v
 }
@@ -264,8 +335,13 @@ func (s *Server) handleBackupTargetState(w http.ResponseWriter, r *http.Request)
 			out["message"] = s.msg(r, degradedMessageFor(st))
 			if st.OfferPath != "" {
 				out["offer_path"] = st.OfferPath
+				out["offer_unproven"] = st.OfferUnproven // R-1084
 				out["offer_label"] = st.OfferLabel
-				out["offer_message"] = s.msg(r, backupTargetOfferKey)
+				offerKey := backupTargetOfferKey
+				if st.OfferUnproven {
+					offerKey = backupTargetOfferUnprovenKey // R-1084
+				}
+				out["offer_message"] = s.msg(r, offerKey)
 			}
 		}
 	}

controller/internal/web/i18n_cases_c_test.go

@@ -17,6 +17,10 @@ func i18nStoragePaths() []m {
 			"AppCount": 0, "IsEnrolled": false},
 		{"Path": "/mnt/hdd3", "Label": "HDD három", "IsDefault": false, "Schedulable": true, "IsMounted": true,
 			"DiskInfo": m{"UsedHuman": "10 GB", "TotalHuman": "1 TB", "UsedPercent": 1.0}, "AppCount": 0, "IsEnrolled": true},
+		// v0.318.0 (`16` §5): the internal data place — its one line, and no safe-disconnect or retire button even
+		// where the card would otherwise carry one (IsUSB).
+		{"Path": "/mnt/felhom-drives/belso", "Label": "Belső tárhely", "IsDefault": false, "Schedulable": true, "IsMounted": true,
+			"IsInternal": true, "IsUSB": true, "AppCount": 0, "IsEnrolled": true},
 	}
 }
 

controller/internal/web/intermediary.go

@@ -313,6 +313,7 @@ func (s *Server) ReconcileDriveGates() {
 		return
 	}
 	s.reconcileEjectedDrives(ctx, agent, resp.Disks)
+	s.ensureInternalPlace(ctx, agent, resp.Disks) // v0.318.0 `16` §5: the one-disk box's data place, no press needed
 	for _, a := range planDriveGates(s.settings.GetStoragePaths(), resp.Disks) {
 		switch {
 		case a.Stop:

controller/internal/web/internal_place.go

@@ -0,0 +1,108 @@
+package web
+
+import (
+	"context"
+	"net/http"
+	"path"
+	"time"
+
+	"gitea.dooplex.hu/admin/felhom-controller/internal/agentapi"
+	"gitea.dooplex.hu/admin/felhom-controller/internal/settings"
+)
+
+// The internal data place („Belső tárhely", v0.318.0) — felhom.eu architecture/16-storage-physical-identity.md §5.
+//
+// On a one-disk box the installer (or an operator's signed job) makes a second volume on the system disk, and the
+// agent (≥ 0.158.0) mounts it like a drive and reports it in GET /disks with kind „internal". The controller then,
+// with no household press:
+//  1. asks the agent to bind it into this guest (POST /disks/guest-attach — scoped to this guest's own token), and
+//  2. on the next drive-gate tick, once the bind is live, registers it as a drive of kind internal — the DEFAULT
+//     drive when no other drive is default — so media and data-folder apps install with no extra step and no
+//     sentence (R-1068; the D4 refusal stays for a box with no drive at all).
+//
+// It is never offered for the drive lifecycle that would remove or format it (eject, decommission, wipe —
+// refuseInternalLifecycle); the agent refuses those too (its device is on the system disk). Moving its data to
+// another drive stays allowed. Its physical disk is the system disk, so build A never counts a copy between it and
+// sys_drive as a second copy. Pinned by internal_place_test.go.
+
+// internalPlaceAgent is the one agent call this needs (a seam for tests).
+type internalPlaceAgent interface {
+	GuestAttach(ctx context.Context, where string) error
+}
+
+// ensureInternalPlace runs on every drive-gate tick (ReconcileDriveGates) with the agent's current /disks rows.
+func (s *Server) ensureInternalPlace(ctx context.Context, agent internalPlaceAgent, disks []agentapi.DiskInfo) {
+	if s.settings == nil {
+		return
+	}
+	for _, d := range disks {
+		if d.Kind != agentapi.PlaceKindInternal || d.MountPath == "" || d.GuestPath == "" {
+			continue
+		}
+		gp := path.Clean(d.GuestPath)
+		if !d.BoundUnderParent {
+			// Bind it now; register on a later tick, once the bind is live (the skeleton is made in-guest).
+			if err := agent.GuestAttach(ctx, d.MountPath); err != nil {
+				s.logger.Printf("[WARN] [internal-place] guest bind of %s failed: %v", d.MountPath, err)
+				return
+			}
+			s.logger.Printf("[INFO] [internal-place] bound %s into the guest at %s", d.MountPath, gp)
+			return
+		}
+		for _, sp := range s.settings.GetStoragePaths() {
+			if path.Clean(sp.Path) == gp {
+				return // registered already (by us, or by the household on an older controller)
+			}
+		}
+		if err := s.registerInternalPlace(gp); err != nil {
+			s.logger.Printf("[WARN] [internal-place] register %s failed: %v", gp, err)
+			return
+		}
+		return
+	}
+}
+
+// registerInternalPlace records the internal place as a drive of kind internal — the default drive unless the
+// household already has one.
+func (s *Server) registerInternalPlace(where string) error {
+	setDefault := true
+	for _, sp := range s.settings.GetStoragePaths() {
+		if sp.IsDefault && !sp.IsNetwork() && !sp.Decommissioned {
+			setDefault = false
+		}
+	}
+	if err := s.ensureUserdataSkeleton(where); err != nil {
+		s.logger.Printf("[WARN] [internal-place] userdata skeleton on %s: %v", where, err)
+	}
+	sp := settings.StoragePath{
+		Path:        where,
+		Label:       s.msgLang(s.settings.GetLanguage(), "storage.belso_tarhely"),
+		IsDefault:   setDefault,
+		Schedulable: true,
+		AddedAt:     time.Now().UTC().Format(time.RFC3339),
+		Kind:        settings.StorageKindInternal,
+	}
+	if err := s.settings.AddStoragePath(sp); err != nil {
+		return err
+	}
+	s.logger.Printf("[INFO] [internal-place] registered %s (default=%v) — media and data-folder apps can use it", where, setDefault)
+	go s.SyncFileBrowserMounts()
+	s.mediaDriveEvent(where, "added")
+	return nil
+}
+
+// refuseInternalLifecycle blocks eject, decommission and wipe of the internal place (it is part of the system disk).
+// Returns true (and writes the refusal) when the path is the internal place; the caller must then return.
+func (s *Server) refuseInternalLifecycle(w http.ResponseWriter, r *http.Request, where string) bool {
+	if s.settings == nil {
+		return false
+	}
+	p := path.Clean(where)
+	for _, sp := range s.settings.GetStoragePaths() {
+		if sp.IsInternal() && path.Clean(sp.Path) == p {
+			writeDiskJSON(w, http.StatusBadRequest, false, s.msg(r, "err.web.belso_tarhely_eletciklus"), nil)
+			return true
+		}
+	}
+	return false
+}

controller/internal/web/internal_place_test.go

@@ -0,0 +1,103 @@
+package web
+
+import (
+	"context"
+	"net/http/httptest"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"gitea.dooplex.hu/admin/felhom-controller/internal/agentapi"
+	"gitea.dooplex.hu/admin/felhom-controller/internal/settings"
+)
+
+// The internal data place (felhom.eu architecture/16 §5, v0.318.0): bound and registered with no press, the default
+// drive when there is no other, never ejected, retired or formatted.
+
+func internalRow(gp string, bound bool) agentapi.DiskInfo {
+	return agentapi.DiskInfo{Name: "belso", Kind: agentapi.PlaceKindInternal, MountPath: "/mnt/belso", GuestPath: gp,
+		BoundUnderParent: bound, Role: "user-data"}
+}
+
+func TestInternalPlace_UnboundIsBoundNotYetRegistered(t *testing.T) {
+	s := testServer(t)
+	gp := filepath.Join(t.TempDir(), "belso")
+	ag := &mockAgent{}
+	s.ensureInternalPlace(context.Background(), ag, []agentapi.DiskInfo{internalRow(gp, false)})
+	if len(ag.guestAttachCalls) != 1 || ag.guestAttachCalls[0] != "/mnt/belso" {
+		t.Fatalf("want one guest bind of /mnt/belso, got %v", ag.guestAttachCalls)
+	}
+	if n := len(s.settings.GetStoragePaths()); n != 0 {
+		t.Fatalf("an unbound place must not be registered yet, got %d path(s)", n)
+	}
+}
+
+func TestInternalPlace_BoundIsRegisteredAsTheDefaultDrive(t *testing.T) {
+	s := testServer(t)
+	gp := filepath.Join(t.TempDir(), "belso")
+	ag := &mockAgent{}
+	s.ensureInternalPlace(context.Background(), ag, []agentapi.DiskInfo{internalRow(gp, true)})
+	paths := s.settings.GetStoragePaths()
+	if len(paths) != 1 {
+		t.Fatalf("want the internal place registered once, got %+v", paths)
+	}
+	sp := paths[0]
+	if sp.Path != gp || !sp.IsInternal() || !sp.IsDefault || !sp.Schedulable || sp.Label == "" || strings.Contains(sp.Label, ".") {
+		t.Fatalf("registered as: %+v", sp)
+	}
+	if len(ag.guestAttachCalls) != 0 {
+		t.Fatalf("a bound place needs no new bind, got %v", ag.guestAttachCalls)
+	}
+	// Idempotent: the next tick changes nothing.
+	s.ensureInternalPlace(context.Background(), ag, []agentapi.DiskInfo{internalRow(gp, true)})
+	if n := len(s.settings.GetStoragePaths()); n != 1 {
+		t.Fatalf("a second tick must not register it again, got %d", n)
+	}
+}
+
+func TestInternalPlace_HouseholdDefaultStaysDefault(t *testing.T) {
+	s := testServer(t)
+	usb := filepath.Join(t.TempDir(), "hdd_1")
+	if err := s.settings.AddStoragePath(settings.StoragePath{Path: usb, IsDefault: true, Schedulable: true}); err != nil {
+		t.Fatal(err)
+	}
+	gp := filepath.Join(t.TempDir(), "belso")
+	s.ensureInternalPlace(context.Background(), &mockAgent{}, []agentapi.DiskInfo{internalRow(gp, true)})
+	for _, sp := range s.settings.GetStoragePaths() {
+		if sp.Path == gp && sp.IsDefault {
+			t.Fatalf("the household's own default drive must stay the default")
+		}
+		if sp.Path == usb && !sp.IsDefault {
+			t.Fatalf("the USB default was taken away")
+		}
+	}
+}
+
+func TestInternalPlace_OtherKindsAreNotTouched(t *testing.T) {
+	s := testServer(t)
+	ag := &mockAgent{}
+	usb := agentapi.DiskInfo{Name: "hdd_1", Kind: "disk", MountPath: "/mnt/hdd_1", GuestPath: filepath.Join(t.TempDir(), "hdd_1"), BoundUnderParent: false}
+	s.ensureInternalPlace(context.Background(), ag, []agentapi.DiskInfo{usb})
+	if len(ag.guestAttachCalls) != 0 || len(s.settings.GetStoragePaths()) != 0 {
+		t.Fatalf("a household drive is enrolled only by the household: attach=%v paths=%v", ag.guestAttachCalls, s.settings.GetStoragePaths())
+	}
+}
+
+// Eject, decommission and wipe of the internal place are refused in words. Positive control: a normal drive path is
+// not refused by this gate.
+func TestInternalPlace_LifecycleRefused(t *testing.T) {
+	s := testServer(t)
+	gp := filepath.Join(t.TempDir(), "belso")
+	s.ensureInternalPlace(context.Background(), &mockAgent{}, []agentapi.DiskInfo{internalRow(gp, true)})
+	r := httptest.NewRequest("POST", "/api/storage/eject", nil)
+	w := httptest.NewRecorder()
+	if !s.refuseInternalLifecycle(w, r, gp+"/") {
+		t.Fatalf("the internal place must be refused")
+	}
+	if w.Code != 400 || !strings.Contains(w.Body.String(), "lemez") {
+		t.Fatalf("refusal: %d %s", w.Code, w.Body.String())
+	}
+	if s.refuseInternalLifecycle(httptest.NewRecorder(), r, "/mnt/felhom-drives/hdd_1") {
+		t.Fatalf("positive control: a household drive is not refused by this gate")
+	}
+}

controller/internal/web/partitions_test.go

@@ -0,0 +1,99 @@
+package web
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"gitea.dooplex.hu/admin/felhom-controller/internal/agentapi"
+	"gitea.dooplex.hu/admin/felhom-controller/internal/settings"
+)
+
+// Partitions as places (felhom.eu architecture/16 §6, v0.318.0): the free part of a disk whose other part is a
+// registered drive stays on offer; the whole disk never does — in the list AND on the server.
+
+const partMounts = `/dev/mapper/pve-root /mnt/felhom-drives ext4 rw,relatime 0 0
+/dev/sdb1 /mnt/felhom-drives/hdd_1 ext4 rw,relatime 0 0
+/dev/mapper/pve-vm--9201--disk--1 /mnt/sys_drive ext4 rw,relatime 0 0
+`
+
+func diskWithParts() agentapi.DiskCandidate {
+	return agentapi.DiskCandidate{Device: "/dev/sdb", MountSource: "/dev/sdb1", FSType: "ext4", DataBearing: true,
+		Partitions: []agentapi.CandidatePartition{
+			{Device: "/dev/sdb1", Number: 1, FSType: "ext4", State: agentapi.PartInUse, MountedAt: "/mnt/felhom-drives/hdd_1"},
+			{Device: "/dev/sdb2", Number: 2, State: agentapi.PartEmpty},
+			{Device: "/dev/sdb3", Number: 3, FSType: "ext4", State: agentapi.PartFilesystem, Mountable: true, DurableID: "uuid:3333"},
+		}}
+}
+
+func TestPartitions_FreePartsOfAnInUseDiskStayOffered(t *testing.T) {
+	reg := map[string]bool{"/mnt/felhom-drives/hdd_1": true}
+	got := dropRegisteredDrives(agentapi.CandidatesResult{Initialize: []agentapi.DiskCandidate{diskWithParts()}}, partMounts, reg)
+	if len(got.Initialize) != 1 {
+		t.Fatalf("the disk must stay listed for its free parts, got %+v", got.Initialize)
+	}
+	c := got.Initialize[0]
+	if !c.WholeDiskInUse {
+		t.Fatalf("the whole disk must be marked in use (no whole-disk action): %+v", c)
+	}
+	if len(c.Partitions) != 2 || c.Partitions[0].Device != "/dev/sdb2" || c.Partitions[1].Device != "/dev/sdb3" {
+		t.Fatalf("only the free parts may be offered, got %+v", c.Partitions)
+	}
+}
+
+// R-542 unchanged: a disk with nothing free is still dropped.
+func TestPartitions_InUseDiskWithNoFreePartIsDropped(t *testing.T) {
+	d := diskWithParts()
+	d.Partitions = d.Partitions[:1]
+	got := dropRegisteredDrives(agentapi.CandidatesResult{Initialize: []agentapi.DiskCandidate{d}}, partMounts, map[string]bool{"/mnt/felhom-drives/hdd_1": true})
+	if len(got.Initialize) != 0 {
+		t.Fatalf("a disk with no free part must not be offered, got %+v", got.Initialize)
+	}
+}
+
+func TestPartitions_ServerRefusesTheWholeDiskButNotTheFreePart(t *testing.T) {
+	reg := map[string]bool{"/mnt/felhom-drives/hdd_1": true}
+	for dev, want := range map[string]bool{"/dev/sdb": true, "/dev/sdb1": true, "/dev/sdb2": false, "/dev/sdc": false} {
+		if got := deviceBacksRegistered(dev, partMounts, reg); got != want {
+			t.Errorf("%s: backs a registered drive = %v, want %v", dev, got, want)
+		}
+	}
+	if !deviceBacksRegistered("/dev/sdc", "", reg) {
+		t.Errorf("an unreadable mount table must refuse (fail-safe)")
+	}
+}
+
+func TestPartitions_AFormattedPartsUUIDIsFound(t *testing.T) {
+	ag := &mockAgent{candidates: agentapi.CandidatesResult{Initialize: []agentapi.DiskCandidate{diskWithParts()}}}
+	if got := resolveEnrollUUID(context.Background(), ag, "/dev/sdb3"); got != "3333" {
+		t.Fatalf("the part's new filesystem must be found for the mount, got %q", got)
+	}
+}
+
+// The handler asks before it starts anything: the whole disk under a registered part → 409, never a format job.
+// Positive control: the free part passes the guard and reaches the agent step (503 here: no agent configured).
+func TestPartitions_InitHandlerRefusesTheWholeDisk(t *testing.T) {
+	s := testServer(t)
+	s.mountsFn = func() string { return partMounts }
+	if err := s.settings.AddStoragePath(settingsPath("/mnt/felhom-drives/hdd_1")); err != nil {
+		t.Fatal(err)
+	}
+	post := func(dev string) int {
+		w := httptest.NewRecorder()
+		r := httptest.NewRequest("POST", "/api/storage/init", strings.NewReader(`{"device":"`+dev+`","fstype":"ext4","mount_name":"films"}`))
+		s.handleStorageInit(w, r)
+		return w.Code
+	}
+	if c := post("/dev/sdb"); c != http.StatusConflict {
+		t.Fatalf("the whole disk under a registered part: want 409, got %d", c)
+	}
+	if c := post("/dev/sdb2"); c == http.StatusConflict {
+		t.Fatalf("positive control: the free part must pass the guard, got %d", c)
+	}
+}
+
+func settingsPath(p string) settings.StoragePath {
+	return settings.StoragePath{Path: p, Schedulable: true}
+}

controller/internal/web/r1082_sysdrive_hidden_test.go

@@ -0,0 +1,36 @@
+package web
+
+import "testing"
+
+// R-1082 (operator ruling 2026-10-16 „hide it now"; felhom.eu architecture/16 §11): the drives page never offers the
+// guest's own data volume to attach — /mnt/sys_drive rides in every whole-box copy. The raw filter
+// (mountedUnregisteredStores) still sees it; what the page offers (attachableStores) does not.
+
+const r1082Mounts = demoHPMounts +
+	"/dev/mapper/pve-vm--9201--disk--1 /var/lib/felhom ext4 rw,relatime 0 0\n" +
+	"/dev/mapper/pve-vm--9201--disk--1 /mnt/films ext4 rw,relatime 0 0\n" + // a second bind of the same volume
+	"/dev/sdd1 /mnt/usb_films ext4 rw,relatime 0 0\n" // a real USB drive with a filesystem
+
+func TestR1082_SysDriveAndItsAliasesAreNotOffered(t *testing.T) {
+	got := withoutSystemVolume(mountedUnregisteredStores(r1082Mounts, map[string]bool{}), r1082Mounts, "/mnt/sys_drive")
+	if len(got) != 1 || got[0].Path != "/mnt/usb_films" {
+		t.Fatalf("want only the USB drive offered (positive control), got %+v", got)
+	}
+}
+
+func TestR1082_EmptyConfigFallsBackToHiding(t *testing.T) {
+	got := withoutSystemVolume(mountedUnregisteredStores(demoHPMounts, map[string]bool{}), demoHPMounts, "")
+	if len(got) != 0 {
+		t.Fatalf("with no configured system data path, sys_drive must still be hidden, got %+v", got)
+	}
+}
+
+// The page's own list (the derivation the candidates endpoint and the restore page share) hides it.
+func TestR1082_AttachableStoresHidesSysDrive(t *testing.T) {
+	s := testServer(t)
+	s.cfg.Paths.SystemDataPath = "/mnt/sys_drive"
+	got := s.attachableStoresFrom(r1082Mounts)
+	if len(got) != 1 || got[0].Path != "/mnt/usb_films" {
+		t.Fatalf("the page must offer only the USB drive, got %+v", got)
+	}
+}

controller/internal/web/r1084_offer_identity_test.go

@@ -0,0 +1,90 @@
+package web
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"gitea.dooplex.hu/admin/felhom-controller/internal/agentapi"
+	"gitea.dooplex.hu/admin/felhom-controller/internal/settings"
+)
+
+// R-1084 (v0.318.0, felhom.eu architecture/16 §4): the whole-box backup offer promises survival of a DISK failure only
+// for a drive the agent proves is another disk than the system data. Seen on Tester 1 (a VM): the promise stood next to
+// build A's „cannot check" notice.
+
+func offerHarness(t *testing.T, rel map[string]offerRelation, paths ...string) *Server {
+	t.Helper()
+	var disks []agentapi.DiskInfo
+	for _, p := range paths {
+		disks = append(disks, agentapi.DiskInfo{Name: p, GuestPath: p, MountPath: "/mnt/" + strings.TrimPrefix(p, "/mnt/felhom-drives/"), Role: "user-data"})
+	}
+	s := absentHarness(t, "local", disks, "")
+	for _, p := range paths {
+		if err := s.settings.AddStoragePath(settings.StoragePath{Path: p, Label: "Meghajtó " + p}); err != nil {
+			t.Fatal(err)
+		}
+	}
+	s.sameDiskFn = func(_ context.Context, drive, sysData string) offerRelation {
+		if sysData != "/mnt/sys_drive" {
+			t.Errorf("the offer must compare against the system data path, got %q", sysData)
+		}
+		return rel[drive]
+	}
+	return s
+}
+
+const drvA, drvB = "/mnt/felhom-drives/hdd_1", "/mnt/felhom-drives/hdd_2"
+
+func TestR1084_ProvenDifferentDiskKeepsThePromise(t *testing.T) {
+	s := offerHarness(t, map[string]offerRelation{drvA: offerDifferent}, drvA)
+	v := s.backupTargetView(context.Background(), "hu")
+	if v == nil || v.OfferPath != drvA || v.OfferText != huText(t, backupTargetOfferKey) {
+		t.Fatalf("a proven different disk: want today's offer, got %+v", v)
+	}
+}
+
+func TestR1084_UnprovenDiskIsOfferedWithoutThePromise(t *testing.T) {
+	s := offerHarness(t, map[string]offerRelation{drvA: offerUnknown}, drvA)
+	v := s.backupTargetView(context.Background(), "hu")
+	if v == nil || v.OfferPath != drvA {
+		t.Fatalf("an unproven disk is still offered, got %+v", v)
+	}
+	if strings.Contains(v.OfferText, "így egy lemezhiba után is vissza tudod") || !strings.Contains(v.OfferText, "nem tudja ellenőrizni") {
+		t.Fatalf("an unproven disk must not carry the disk-failure promise; got %q", v.OfferText)
+	}
+}
+
+func TestR1084_SameDiskIsNeverOffered(t *testing.T) {
+	s := offerHarness(t, map[string]offerRelation{drvA: offerSame}, drvA)
+	if v := s.backupTargetView(context.Background(), "hu"); v == nil || v.OfferPath != "" {
+		t.Fatalf("a drive on the system disk must not be offered as the backup place, got %+v", v)
+	}
+}
+
+func TestR1084_AProvenDiskWinsOverAnUnprovenOne(t *testing.T) {
+	s := offerHarness(t, map[string]offerRelation{drvA: offerUnknown, drvB: offerDifferent}, drvA, drvB)
+	if v := s.backupTargetView(context.Background(), "hu"); v == nil || v.OfferPath != drvB || v.OfferText != huText(t, backupTargetOfferKey) {
+		t.Fatalf("the proven different disk must be offered first, got %+v", v)
+	}
+}
+
+// An agent older than 0.157.0 cannot judge: today's offer stays (build A's rule for an older agent).
+func TestR1084_OlderAgentKeepsTodaysOffer(t *testing.T) {
+	s := offerHarness(t, map[string]offerRelation{drvA: offerLegacy}, drvA)
+	if v := s.backupTargetView(context.Background(), "hu"); v == nil || v.OfferPath != drvA || v.OfferText != huText(t, backupTargetOfferKey) {
+		t.Fatalf("an older agent: want today's offer, got %+v", v)
+	}
+}
+
+// The internal place is never the whole-box backup place (it is the system disk).
+func TestR1084_InternalPlaceIsNeverOffered(t *testing.T) {
+	s := absentHarness(t, "local", []agentapi.DiskInfo{{Name: "belso", GuestPath: "/mnt/felhom-drives/belso", MountPath: "/mnt/belso", Role: "user-data", Kind: agentapi.PlaceKindInternal}}, "")
+	if err := s.settings.AddStoragePath(settings.StoragePath{Path: "/mnt/felhom-drives/belso", Kind: settings.StorageKindInternal}); err != nil {
+		t.Fatal(err)
+	}
+	s.sameDiskFn = func(context.Context, string, string) offerRelation { return offerLegacy } // even an old judge
+	if v := s.backupTargetView(context.Background(), "hu"); v == nil || v.OfferPath != "" {
+		t.Fatalf("the internal place must not be offered, got %+v", v)
+	}
+}

controller/internal/web/server.go

@@ -251,6 +251,11 @@ type Server struct {
 	// pure copy helper. Without it the resolver's own branching had no test at all, which is how the
 	// configured-but-absent case reached production saying the wrong thing.
 	tiersFn func(context.Context) (agentapi.TiersResponse, error)
+	// sameDiskFn (R-1084, v0.318.0) is the test seam for the backup-target offer's same-disk question
+	// (nil → the real agent client, POST /disks/same-disk).
+	sameDiskFn func(ctx context.Context, drive, systemData string) offerRelation
+	// mountsFn (v0.318.0) is the test seam for the guest's mount table (nil → /proc/mounts).
+	mountsFn func() string
 
 	// App-email SMTP shim lifecycle (optional — nil when no hub is configured or the kill-switch is
 	// off). The global app-email settings toggle calls Apply() so the shim starts/stops at runtime.

controller/internal/web/storage_handlers.go

@@ -86,6 +86,14 @@ func resolveEnrollUUID(ctx context.Context, agent diskAgent, device string) stri
 				return rest
 			}
 		}
+		// `16` §6 (agent ≥ 0.158.0): a formatted PART reports its new filesystem under the disk's partitions.
+		for _, p := range c.Partitions {
+			if p.Device == device {
+				if rest, ok := strings.CutPrefix(p.DurableID, "uuid:"); ok {
+					return rest
+				}
+			}
+		}
 	}
 	return ""
 }
@@ -503,6 +511,9 @@ func (s *Server) handleStorageDecommission(w http.ResponseWriter, r *http.Reques
 	if s.refuseNetworkLifecycle(w, req.Where) {
 		return
 	}
+	if s.refuseInternalLifecycle(w, r, req.Where) { // v0.318.0 `16` §5
+		return
+	}
 
 	switch req.Mode {
 	case "migrate":
@@ -651,6 +662,14 @@ func (s *Server) handleStorageInit(w http.ResponseWriter, r *http.Request) {
 		writeDiskJSON(w, http.StatusBadRequest, false, s.msg(r, "disk.err.device_required"), nil)
 		return
 	}
+	// `16` §6 (v0.318.0): never format a device that backs a REGISTERED drive — the whole disk under a registered part
+	// included. The list (dropRegisteredDrives) already hides it; this is the server-side half, so a stale page or a
+	// direct call cannot reach it. A FREE part next to the registered one is allowed (the agent and its root wrapper
+	// re-check, as root).
+	if deviceBacksRegistered(req.Device, s.mountTable(), s.registeredStoragePaths()) {
+		writeDiskJSON(w, http.StatusConflict, false, s.msg(r, "err.web.meghajto_hasznalatban_formazas"), nil)
+		return
+	}
 	agent, err := s.agentClient()
 	if err != nil {
 		writeDiskJSON(w, http.StatusServiceUnavailable, false, s.errText(r, err), nil)
@@ -764,6 +783,9 @@ func (s *Server) handleStorageWipe(w http.ResponseWriter, r *http.Request) {
 	if s.refuseNetworkLifecycle(w, req.Where) {
 		return
 	}
+	if s.refuseInternalLifecycle(w, r, req.Where) { // v0.318.0 `16` §5
+		return
+	}
 	// Server-side type-to-confirm: the typed name must match the mount's basename exactly.
 	if strings.TrimSpace(req.MountName) != path.Base(req.Where) {
 		writeDiskJSON(w, http.StatusBadRequest, false, s.msg(r, "disk.err.name_mismatch"), nil)
@@ -982,6 +1004,9 @@ func (s *Server) handleStorageEject(w http.ResponseWriter, r *http.Request) {
 	if s.refuseNetworkLifecycle(w, req.Where) {
 		return
 	}
+	if s.refuseInternalLifecycle(w, r, req.Where) { // v0.318.0 `16` §5
+		return
+	}
 	agent, err := s.agentClient()
 	if err != nil {
 		writeDiskJSON(w, http.StatusServiceUnavailable, false, s.errText(r, err), nil)

controller/internal/web/templates/storage.html

@@ -82,6 +82,9 @@
                     </div>
                 </div>
                 {{end}}
+                {{if .IsInternal}}
+                <div class="form-hint">{{T "storage.belso_tarhely_magyarazat"}}</div>
+                {{end}}
                 {{if .FSInfo}}
                 <div class="storage-path-fsinfo mono form-hint">
                     {{.FSInfo.FSType}} · {{.FSInfo.Device}}{{if .FSInfo.Model}} · {{.FSInfo.Model}}{{end}}
@@ -138,7 +141,7 @@
                     <button type="submit" class="btn btn-xs btn-outline" title="{{T "storage.a_meghajto_ujra_valaszthato_az"}}">{{T "storage.uj_telepitesek_engedelyezese"}}</button>
                 </form>
                 {{end}}
-                {{if .IsUSB}}
+                {{if and .IsUSB (not .IsInternal)}}
                 <button class="btn btn-xs btn-danger-outline" onclick="storageDisconnect('{{.Path}}', '{{.Label}}', {{.AppCount}})" title="{{T "storage.az_itt_tarolt_alkalmazasok_leallnak"}}">{{T "storage.biztonsagos_levalasztas"}}</button>
                 {{end}}
                 {{/* List-removal is the undo of a MANUAL add only. Wizard-enrolled drives
@@ -163,7 +166,9 @@
                     <button class="btn btn-xs btn-outline" onclick="storageMigrateAll('{{.Path}}','{{.Label}}')">{{T "storage.osszes_adat_athelyezese"}}</button>
                 </span>
                 {{end}}
+                {{if not .IsInternal}}
                 <button class="btn btn-xs btn-danger-outline" onclick="storageDecommission('{{.Path}}','{{.Label}}',{{.AppCount}})" title="{{T "storage.a_meghajto_vegleges_kivonasa_a"}}">{{T "storage.vegleges_leszereles"}}</button>
+                {{end}}
             </div>
             {{end}}
         </div>
@@ -303,6 +308,8 @@ window.__registeredPaths=[{{range .StoragePaths}}{{if .Path}}"{{.Path}}",{{end}}
   function actions(d, registered, hasSafeDisconnect){
     // Destructive controls ONLY for user-data drives that are mounted under /mnt. System/backup get none.
     if(d.role!=='user-data' || !d.mount_path || d.mount_path.indexOf('/mnt/')!==0) return '';
+    // The internal data place (`16` §5) is part of the system disk: no eject, no format (the agent refuses both too).
+    if(d.kind==='internal') return '';
     // A user-data drive that ALSO backs the whole-system backup (agent `backup_target`): the agent refuses its eject
     // (403) and a data-bearing format needs a signed job, so neither button is offered (R-298 design, 2026-10-08).
     if(d.backup_target){

controller/internal/web/templates/storage_attach.html

@@ -71,6 +71,20 @@ async function loadDisks(){
     var cands = (j.data&&j.data.attach)||[];
     if(cands.length===0){ document.getElementById('disk-list').innerHTML='<p class="form-hint">{{T "storage_attach.nincs_csatolhato_meghajto_a_csatolashoz"}}</p>'; return; }
     var html='<div class="drive-list">';
+    // `16` §6 (agent ≥ 0.158.0): a disk that lists its parts offers each usable part (an ext4/xfs filesystem not yet
+    // a drive) as its own card, instead of the disk's first filesystem.
+    var flat=[];
+    cands.forEach(function(d){
+      var usable=(d.partitions||[]).filter(function(p){ return p.state==='filesystem' && p.mountable; });
+      if(!d.already_mounted && d.partitions && d.partitions.length){
+        usable.forEach(function(p){ flat.push({device:p.device, mount_source:p.device, fstype:p.fstype, size_bytes:p.size_bytes,
+          model:(d.model?d.model:d.device)+' — '+'{{T "storage_wizard.resz_n"}}'.replace('{n}', p.number||'?')}); });
+        return;
+      }
+      flat.push(d);
+    });
+    cands=flat;
+    if(cands.length===0){ document.getElementById('disk-list').innerHTML='<p class="form-hint">{{T "storage_attach.nincs_csatolhato_meghajto_a_csatolashoz"}}</p>'; return; }
     cands.forEach(function(d,i){
       var title = d.model ? esc(d.model) : esc(d.device);
       var parts = [esc(d.device)];

controller/internal/web/templates/storage_init.html

@@ -82,16 +82,26 @@ async function loadDisks(){
     var cands = (j.data&&j.data.initialize)||[];
     if(cands.length===0){ document.getElementById('disk-list').innerHTML='<p class="form-hint">{{T "storage_init.nincs_elerheto_meghajto_az_inicializalas"}}</p>'; return; }
     var html='<div class="drive-list">';
-    cands.forEach(function(d,i){
+    var n=0;
+    function card(dev, title, sub, db){
+      var i=n++;
+      return '<label class="drive-card role-user-data is-selectable" id="dc-'+i+'">'
+        +'<div class="drive-card-top"><div class="drive-select"><input type="radio" name="disk" value="'+esc(dev)+'" data-db="'+(db?'1':'0')+'" data-i="'+i+'" onchange="pickDisk(this)">'
+        +'<div class="drive-id"><span class="drive-name">'+title+'</span><span class="drive-sub">'+sub+'</span></div></div>'
+        +'<div class="drive-badges">'+dataBadge({data_bearing:db})+'</div></div></label>';
+    }
+    cands.forEach(function(d){
       var title = d.model ? esc(d.model) : esc(d.device);
       var parts = [esc(d.device)];
       if(d.size_bytes) parts.push(fmtSize(d.size_bytes));
       if(d.fstype) parts.push('{{T "storage_init.jelenlegi"}} '+esc(d.fstype));
-      var sub = parts.join(' · ');
-      html+='<label class="drive-card role-user-data is-selectable" id="dc-'+i+'">'
-        +'<div class="drive-card-top"><div class="drive-select"><input type="radio" name="disk" value="'+esc(d.device)+'" data-db="'+(d.data_bearing?'1':'0')+'" data-i="'+i+'" onchange="pickDisk(this)">'
-        +'<div class="drive-id"><span class="drive-name">'+title+'</span><span class="drive-sub">'+sub+'</span></div></div>'
-        +'<div class="drive-badges">'+dataBadge(d)+'</div></div></label>';
+      // `16` §6: a disk whose other part is already a drive offers only its free parts, never the whole disk.
+      if(!d.whole_disk_in_use) html+=card(d.device, title, parts.join(' · '), d.data_bearing);
+      (d.partitions||[]).forEach(function(p){
+        if(p.state!=='empty' && p.state!=='filesystem') return;
+        var ps=[esc(p.device)]; if(p.size_bytes) ps.push(fmtSize(p.size_bytes)); if(p.fstype) ps.push('{{T "storage_init.jelenlegi"}} '+esc(p.fstype));
+        html+=card(p.device, title+' — '+'{{T "storage_wizard.resz_n"}}'.replace('{n}', p.number||'?'), ps.join(' · '), p.state==='filesystem');
+      });
     });
     html+='</div>';
     document.getElementById('disk-list').innerHTML=html;

controller/internal/web/testdata/i18n_parity/storage_attach.html

@@ -243,6 +243,20 @@ async function loadDisks(){
     var cands = (j.data&&j.data.attach)||[];
     if(cands.length===0){ document.getElementById('disk-list').innerHTML='<p class="form-hint">Nincs csatolható meghajtó — a csatoláshoz olyan (még nem használt) meghajtó kell, amelyen már van fájlrendszer. Új, üres meghajtóhoz használd az „Inicializálás” lehetőséget.</p>'; return; }
     var html='<div class="drive-list">';
+    
+    
+    var flat=[];
+    cands.forEach(function(d){
+      var usable=(d.partitions||[]).filter(function(p){ return p.state==='filesystem' && p.mountable; });
+      if(!d.already_mounted && d.partitions && d.partitions.length){
+        usable.forEach(function(p){ flat.push({device:p.device, mount_source:p.device, fstype:p.fstype, size_bytes:p.size_bytes,
+          model:(d.model?d.model:d.device)+' — '+'{n}. rész'.replace('{n}', p.number||'?')}); });
+        return;
+      }
+      flat.push(d);
+    });
+    cands=flat;
+    if(cands.length===0){ document.getElementById('disk-list').innerHTML='<p class="form-hint">Nincs csatolható meghajtó — a csatoláshoz olyan (még nem használt) meghajtó kell, amelyen már van fájlrendszer. Új, üres meghajtóhoz használd az „Inicializálás” lehetőséget.</p>'; return; }
     cands.forEach(function(d,i){
       var title = d.model ? esc(d.model) : esc(d.device);
       var parts = [esc(d.device)];

controller/internal/web/testdata/i18n_parity/storage_empty.html

@@ -388,6 +388,8 @@ window.__registeredPaths=[];
     
     if(d.role!=='user-data' || !d.mount_path || d.mount_path.indexOf('/mnt/')!==0) return '';
     
+    if(d.kind==='internal') return '';
+    
     
     if(d.backup_target){
       return registered[regKey(d)] ? '' : '<div class="drive-actions"><button class="btn btn-xs btn-primary" onclick="registerDrive(\''+esc(d.mount_path)+'\')">Regisztrálás</button></div>';

controller/internal/web/testdata/i18n_parity/storage_full.html

@@ -353,6 +353,7 @@
                 </div>
                 
                 
+                
                 <div class="storage-path-fsinfo mono form-hint">
                     ext4 · /dev/sdb1 · WD Red
                 </div>
@@ -403,12 +404,14 @@
                 <span class="migrate-inline" style="display:inline-flex;gap:.35rem;align-items:center">
                     <select id="migrate-target-/mnt/hdd1" class="btn btn-xs btn-outline">
                         <option value="">Áthelyezés ide…</option>
-                        <option value="/mnt/hdd3">HDD három (/mnt/hdd3)</option>
+                        <option value="/mnt/hdd3">HDD három (/mnt/hdd3)</option><option value="/mnt/felhom-drives/belso">Belső tárhely (/mnt/felhom-drives/belso)</option>
                     </select>
                     <button class="btn btn-xs btn-outline" onclick="storageMigrateAll('\/mnt\/hdd1','HDD egy')">Összes adat áthelyezése</button>
                 </span>
                 
+                
                 <button class="btn btn-xs btn-danger-outline" onclick="storageDecommission('\/mnt\/hdd1','HDD egy', 1 )" title="A meghajtó végleges kivonása a rendszerből. Ha céltárolót választ, előbb minden adat átkerül oda; áthelyezés nélkül az adatok a meghajtón maradnak.">Végleges leszerelés</button>
+                
             </div>
             
         </div>
@@ -446,6 +449,7 @@
                 </div>
                 
                 
+                
                 <div class="storage-path-fsinfo mono form-hint">
                     ext4 · /dev/sdc1
                 </div>
@@ -485,7 +489,9 @@
                 </form>
                 
                 
+                
                 <button class="btn btn-xs btn-danger-outline" onclick="storageDecommission('\/mnt\/hdd2','HDD kettő', 0 )" title="A meghajtó végleges kivonása a rendszerből. Ha céltárolót választ, előbb minden adat átkerül oda; áthelyezés nélkül az adatok a meghajtón maradnak.">Végleges leszerelés</button>
+                
             </div>
             
         </div>
@@ -524,6 +530,7 @@
                 
                 
                 
+                
                 <div class="storage-path-meta">
                     
                     <span class="form-hint">Nincs alkalmazás ezen a tárolón</span>
@@ -551,7 +558,67 @@
                 
                 
                 
+                
                 <button class="btn btn-xs btn-danger-outline" onclick="storageDecommission('\/mnt\/hdd3','HDD három', 0 )" title="A meghajtó végleges kivonása a rendszerből. Ha céltárolót választ, előbb minden adat átkerül oda; áthelyezés nélkül az adatok a meghajtón maradnak.">Végleges leszerelés</button>
+                
+            </div>
+            
+        </div>
+        
+        <div class="storage-path-item">
+            <div class="storage-path-header">
+                <div class="storage-path-info">
+                    <div class="storage-path-label-wrap" id="label-wrap-/mnt/felhom-drives/belso">
+                        <span class="storage-path-label" id="label-display-/mnt/felhom-drives/belso">Belső tárhely</span>
+                        <button class="btn btn-xs btn-ghost" onclick="editStorageLabel('\/mnt\/felhom-drives\/belso', 'Belső tárhely')" title="Átnevezés"><svg class="ico ico-sm"><use href="#i-pencil"/></svg></button>
+                    </div>
+                    <span class="storage-path-path mono">/mnt/felhom-drives/belso</span>
+                </div>
+                <div class="storage-path-badges">
+                    
+                    
+                    <span class="tag tag-run"><span class="dot"></span>Aktív</span>
+                    <span class="badge" style="background:rgba(255,165,0,0.15);color:var(--warn)">USB</span>
+                    
+                    
+                </div>
+            </div>
+            
+            <div class="storage-path-details">
+                
+                
+                <div class="form-hint">A gép saját lemezén van, de nem része a teljes rendszermentésnek. Egy lemezhiba ellen egy másik lemez vagy a távoli mentés véd.</div>
+                
+                
+                
+                <div class="storage-path-meta">
+                    
+                    <span class="form-hint">Nincs alkalmazás ezen a tárolón</span>
+                    
+                </div>
+            <div class="drive-agent-extra" id="agent-extra-/mnt/felhom-drives/belso"></div>
+            </div>
+            <div class="storage-path-actions">
+                
+                <form method="POST" action="/settings/storage/default" style="display:inline">
+                    
+                    <input type="hidden" name="storage_path" value="/mnt/felhom-drives/belso">
+                    <button type="submit" class="btn btn-xs btn-outline">Legyen alapértelmezett</button>
+                </form>
+                
+                
+                <form method="POST" action="/settings/storage/schedulable" style="display:inline">
+                    
+                    <input type="hidden" name="storage_path" value="/mnt/felhom-drives/belso">
+                    <input type="hidden" name="schedulable" value="false">
+                    <button type="submit" class="btn btn-xs btn-outline" title="A meghajtó kimarad az új alkalmazás-telepítésekből. A rajta lévő alkalmazások változatlanul futnak.">Új telepítések letiltása</button>
+                </form>
+                
+                
+                
+                
+                
+                
             </div>
             
         </div>
@@ -629,7 +696,7 @@
     <div id="confirm-root"></div>
     <div id="dialog-root"></div>
     <script>
-window.__registeredPaths=["\/mnt\/usb1","\/mnt\/old","\/mnt\/hdd1","\/mnt\/hdd2","\/mnt\/hdd3",];
+window.__registeredPaths=["\/mnt\/usb1","\/mnt\/old","\/mnt\/hdd1","\/mnt\/hdd2","\/mnt\/hdd3","\/mnt\/felhom-drives\/belso",];
 (function(){
   function esc(s){ return String(s==null?'':s).replace(/[&<>"]/g,function(c){return {'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;'}[c];}); }
   function hum(b){ if(!b||b<=0) return ''; var u=['B','KB','MB','GB','TB'],i=0,v=b; while(v>=1024&&i<u.length-1){v/=1024;i++;} return (v>=10||i===0?Math.round(v):fhNum(v, 1))+' '+u[i]; }
@@ -688,6 +755,8 @@ window.__registeredPaths=["\/mnt\/usb1","\/mnt\/old","\/mnt\/hdd1","\/mnt\/hdd2"
     
     if(d.role!=='user-data' || !d.mount_path || d.mount_path.indexOf('/mnt/')!==0) return '';
     
+    if(d.kind==='internal') return '';
+    
     
     if(d.backup_target){
       return registered[regKey(d)] ? '' : '<div class="drive-actions"><button class="btn btn-xs btn-primary" onclick="registerDrive(\''+esc(d.mount_path)+'\')">Regisztrálás</button></div>';

controller/internal/web/testdata/i18n_parity/storage_init.html

@@ -256,16 +256,26 @@ async function loadDisks(){
     var cands = (j.data&&j.data.initialize)||[];
     if(cands.length===0){ document.getElementById('disk-list').innerHTML='<p class="form-hint">Nincs elérhető meghajtó az inicializáláshoz. Csatlakoztass egy új adathordozót — a rendszer-, a biztonsági mentés- és a már használatban lévő meghajtók itt nem jelennek meg.</p>'; return; }
     var html='<div class="drive-list">';
-    cands.forEach(function(d,i){
+    var n=0;
+    function card(dev, title, sub, db){
+      var i=n++;
+      return '<label class="drive-card role-user-data is-selectable" id="dc-'+i+'">'
+        +'<div class="drive-card-top"><div class="drive-select"><input type="radio" name="disk" value="'+esc(dev)+'" data-db="'+(db?'1':'0')+'" data-i="'+i+'" onchange="pickDisk(this)">'
+        +'<div class="drive-id"><span class="drive-name">'+title+'</span><span class="drive-sub">'+sub+'</span></div></div>'
+        +'<div class="drive-badges">'+dataBadge({data_bearing:db})+'</div></div></label>';
+    }
+    cands.forEach(function(d){
       var title = d.model ? esc(d.model) : esc(d.device);
       var parts = [esc(d.device)];
       if(d.size_bytes) parts.push(fmtSize(d.size_bytes));
       if(d.fstype) parts.push('jelenlegi: '+esc(d.fstype));
-      var sub = parts.join(' · ');
-      html+='<label class="drive-card role-user-data is-selectable" id="dc-'+i+'">'
-        +'<div class="drive-card-top"><div class="drive-select"><input type="radio" name="disk" value="'+esc(d.device)+'" data-db="'+(d.data_bearing?'1':'0')+'" data-i="'+i+'" onchange="pickDisk(this)">'
-        +'<div class="drive-id"><span class="drive-name">'+title+'</span><span class="drive-sub">'+sub+'</span></div></div>'
-        +'<div class="drive-badges">'+dataBadge(d)+'</div></div></label>';
+      
+      if(!d.whole_disk_in_use) html+=card(d.device, title, parts.join(' · '), d.data_bearing);
+      (d.partitions||[]).forEach(function(p){
+        if(p.state!=='empty' && p.state!=='filesystem') return;
+        var ps=[esc(p.device)]; if(p.size_bytes) ps.push(fmtSize(p.size_bytes)); if(p.fstype) ps.push('jelenlegi: '+esc(p.fstype));
+        html+=card(p.device, title+' — '+'{n}. rész'.replace('{n}', p.number||'?'), ps.join(' · '), p.state==='filesystem');
+      });
     });
     html+='</div>';
     document.getElementById('disk-list').innerHTML=html;