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ERROR_VOLMGR_PACK_INVALID
What this result says about the disk model: volmgr pack invalid
The practical meaning of ERROR_VOLMGR_PACK_INVALID (0xC0380031) is tied to dynamic-disk pack identity, quorum and replicated configuration log: the disk group exists as an object but its configuration is marked invalid and is not eligible for the requested transaction. The result does not, by itself, prove file-system corruption or physical-media failure.
Dynamic volumes are represented as packs containing disks and volumes; each volume has one or more plexes, and each plex is assembled from members and extents. Indices and counts are relative to the submitted layout generation, while configuration logs are replicated across participating dynamic disks. This object model determines which identifiers, counts and ownership state are meaningful.
The standard message identifies the immediate condition, but this result also requires the producer API, object topology and attempted state transition. Capture them before an automatic refresh advances the storage generation.
Capture the exact object generation
| Storage diagnostic field | Value |
|---|---|
| Rejected invariant | the disk group exists as an object but its configuration is marked invalid and is not eligible for the requested transaction |
| Identity and generation | pack GUID and name, online state, primary flag, disk inventory, configuration-log sequence numbers, quorum view and failing transaction ID |
| Narrow experiment | serialize the exact VM_VOLUME_LAYOUT buffer, validate every count and Size field, and compare it with a layout produced by a known-good management API |
| Closest comparison | ERROR_VOLMGR_PACK_ID_INVALID |
| Owning object | dynamic-disk pack identity, quorum and replicated configuration log |
Do not overwrite this result with a close, detach or rollback error. Preserve the causal order so the original storage contract remains visible.
Prove the boundary in a test volume
- Create a nonproduction case for it that preserves the same geometry and ownership model.
- Collect pack GUID and name, online state, primary flag, disk inventory, configuration-log sequence numbers, quorum view and failing transaction ID before invoking the first mutating API.
- Change one condition only: serialize the exact VM_VOLUME_LAYOUT buffer, validate every count and Size field, and compare it with a layout produced by a known-good management API while diagnosing this result.
- Re-enumerate after the transition and confirm this result is not reproduced by a stale handle from the old generation while diagnosing it.
Compare traces for ERROR_VOLMGR_PACK_ID_INVALID and it. The latter page covers a nearby storage boundary, whereas it rejects the disk group exists as an object but its configuration is marked invalid and is not eligible for the requested transaction. A correct caller should be able to reproduce each case independently.
Mechanism-specific note
Keep the exact storage identity and state transition associated with this HRESULT while diagnosing it. A successful rescan does not prove the original operation was valid, because it may have replaced the object generation that failed.
Safe recovery path
Repair the pack configuration through supported dynamic-disk management, preserving GUIDs and the newest valid log sequence; avoid sector-level edits to replicated metadata. Apply the change through the supported storage API, then close and reacquire affected objects before retrying.
- The controlled A/B case changes only the invariant responsible for it.
- No unrelated disk, cluster owner, tier policy or virtual-disk backing file is altered to hide it.
- Health, synchronization or job state reaches a terminal value consistent with the repaired the operation.
- Telemetry includes both symbolic names when it or
ERROR_VOLMGR_PACK_ID_INVALIDoccurs again.
A reboot, blanket disk conversion or deletion of storage metadata is not a justified first response to it; it changes multiple invariants and can erase the evidence needed to identify the defect.
Technical references
- Microsoft: COM error codes for VOLMGR, VHD and SDIAG — use this source to verify volmgr state and parameters for it.
- Microsoft: Virtual Disk Service object model — documents the supported management path relevant to it.
- Microsoft: Pack object — defines the volmgr objects used to interpret it.
- Microsoft: Virtual Disk Service common return codes — primary API or object-model reference for the boundary.
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