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ERROR_VOLMGR_VOLUME_LENGTH_NOT_SECTOR_SIZE_MULTIPLE
What this result says about the disk model: volmgr volume length not sector size multiple
ERROR_VOLMGR_VOLUME_LENGTH_NOT_SECTOR_SIZE_MULTIPLE (0xC0380048) is emitted by the volmgr path when the logical volume length is not aligned to the sector size required by every participating disk. The deciding object for it is logical volume geometry and the disk extents that realize it, so the first investigation belongs there rather than in a generic “disk failure” bucket.
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 for it. 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.
Keep the first result attached to its request parameters and object generation. Cleanup failures or a later drive-letter change are secondary evidence, not replacements for the original boundary while diagnosing this result.
Capture the exact object generation
| Storage diagnostic field | Value |
|---|---|
| Closest comparison | ERROR_VOLMGR_VOLUME_LENGTH_INVALID |
| Owning object | logical volume geometry and the disk extents that realize it |
| Rejected invariant | the logical volume length is not aligned to the sector size required by every participating disk |
| Identity and generation | volume ID, requested length, sector sizes, extent table, plex/member counts, disk health and the exact VM_VOLUME_LAYOUT buffer |
| Narrow experiment | compare a disk set with identical logical sector sizes against one mixed-geometry test set while keeping extent counts unchanged |
Keep this HRESULT as the primary result if rollback or cleanup reports another code; those later values describe recovery, not the first rejected invariant.
Prove the boundary in a test volume
- serialize the failing request and the enumeration from which its identifiers came while diagnosing this result.
- Preserve volume ID, requested length, sector sizes, extent table, plex/member counts, disk health and the exact VM_VOLUME_LAYOUT buffer while every handle is still valid.
- Repeat the operation using this controlled change: compare a disk set with identical logical sector sizes against one mixed-geometry test set while keeping extent counts unchanged while diagnosing this result.
- Close and reacquire the relevant objects, then run once more to test lifecycle correctness after this result.
Use ERROR_VOLMGR_VOLUME_LENGTH_INVALID as the nearest comparison. It is specific to the logical volume length is not aligned to the sector size required by every participating disk; the neighboring result belongs to another validation or lifecycle branch for it. Keeping both names prevents a generic storage label from hiding the actual owner for it.
Mechanism-specific note
Record logical and physical sector sizes for every layer: image format, host file system and physical disk. Alignment must be checked with integer arithmetic before truncation while diagnosing it. Copying an image to a different device can change the host geometry even when the image bytes and virtual capacity remain identical.
Safe recovery path
Rebuild the layout from enumerated objects and checked arithmetic rather than patching one serialized field; validate counts, indices, sizes, alignment and overflow before submission. The result repair is incomplete until a fresh enumeration and new handle observe the corrected state.
- 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_VOLUME_LENGTH_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 for it.
Technical references
- Microsoft: COM error codes for VOLMGR, VHD and SDIAG — defines the volmgr objects used to interpret it.
- Microsoft: Virtual Disk Service object model — primary API or object-model reference for the boundary.
- Microsoft: Pack object — use this source to verify volmgr state and parameters for it.
- Microsoft: Virtual Disk Service common return codes — documents the supported management path relevant to it.
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