What does HRESULT 0x80820001 (ERROR_VOLSNAP_BOOTFILE_NOT_VALID) mean?

ERROR_VOLSNAP_BOOTFILE_NOT_VALID

Read the code at the owning storage layer: volsnap bootfile not valid

Windows returns ERROR_VOLSNAP_BOOTFILE_NOT_VALID, value 0x80820001, at the volsnap boundary. It means that the persistent-snapshot boot support file cannot hold the metadata needed to activate all configured snapshots during volume arrival in the ERROR_VOLSNAP_BOOTFILE_NOT_VALID path. For ERROR_VOLSNAP_BOOTFILE_NOT_VALID, preserve the exact handle and generation of persistent Volsnap activation metadata used while the volume comes online before any rescan changes the evidence.

Persistent shadow copies must survive volume dismount and later activation for ERROR_VOLSNAP_BOOTFILE_NOT_VALID. Volsnap therefore needs durable activation metadata and enough time to enumerate and bring the stored snapshot state online before the mount sequence proceeds when ERROR_VOLSNAP_BOOTFILE_NOT_VALID is returned. For ERROR_VOLSNAP_BOOTFILE_NOT_VALID, this object model determines which identifiers, counts and ownership state are meaningful while diagnosing ERROR_VOLSNAP_BOOTFILE_NOT_VALID.

Keep the first ERROR_VOLSNAP_BOOTFILE_NOT_VALID result attached to its request parameters and object generation while diagnosing ERROR_VOLSNAP_BOOTFILE_NOT_VALID. Cleanup failures or a later drive-letter change are secondary evidence, not replacements for the original boundary for the ERROR_VOLSNAP_BOOTFILE_NOT_VALID request.

Build a trustworthy incident record

• Attach volume GUID to the ERROR_VOLSNAP_BOOTFILE_NOT_VALID incident so later cleanup cannot replace the original identity in the ERROR_VOLSNAP_BOOTFILE_NOT_VALID path.
• Record persistent snapshot IDs at the instant ERROR_VOLSNAP_BOOTFILE_NOT_VALID is returned, not after an automatic refresh.
• Correlate boot-support file path with the first ERROR_VOLSNAP_BOOTFILE_NOT_VALID call and its transaction or job identifier.
• Export size for ERROR_VOLSNAP_BOOTFILE_NOT_VALID; this is more useful than a drive letter or friendly name alone in the ERROR_VOLSNAP_BOOTFILE_NOT_VALID path.
• Verify volume-online timestamps belongs to the same storage generation that produced ERROR_VOLSNAP_BOOTFILE_NOT_VALID.
• For ERROR_VOLSNAP_BOOTFILE_NOT_VALID, preserve Volsnap/VSS events before a rescan; it anchors the failed object generation while diagnosing ERROR_VOLSNAP_BOOTFILE_NOT_VALID.
• Attach storage latency during activation to the ERROR_VOLSNAP_BOOTFILE_NOT_VALID incident so later cleanup cannot replace the original identity in the ERROR_VOLSNAP_BOOTFILE_NOT_VALID path.

When ERROR_VOLSNAP_BOOTFILE_NOT_VALID is followed by a secondary cleanup failure, store both codes with timestamps and retain this one as the initiating result in the ERROR_VOLSNAP_BOOTFILE_NOT_VALID path.

Controlled comparison

1. Create a nonproduction case for ERROR_VOLSNAP_BOOTFILE_NOT_VALID that preserves the same geometry and ownership model for ERROR_VOLSNAP_BOOTFILE_NOT_VALID.
2. Collect volume GUID, persistent snapshot IDs, boot-support file path and size, volume-online timestamps, Volsnap/VSS events and storage latency during activation before invoking the first mutating API in the ERROR_VOLSNAP_BOOTFILE_NOT_VALID path.
3. Change one condition only: create a controlled persistent snapshot on a test volume, reboot or cycle the volume online, and compare activation with a right-sized support file and low I/O load in the ERROR_VOLSNAP_BOOTFILE_NOT_VALID path.
4. Re-enumerate after the transition and confirm ERROR_VOLSNAP_BOOTFILE_NOT_VALID is not reproduced by a stale handle from the old generation for ERROR_VOLSNAP_BOOTFILE_NOT_VALID.

The distinction from ERROR_VOLSNAP_ACTIVATION_TIMEOUT is operational. For ERROR_VOLSNAP_BOOTFILE_NOT_VALID, the decisive condition is the persistent-snapshot boot support file cannot hold the metadata needed to activate all configured snapshots during volume arrival; log the neighboring code separately so capability, identity and state are not conflated while diagnosing ERROR_VOLSNAP_BOOTFILE_NOT_VALID.

Mechanism-specific note for ERROR_VOLSNAP_BOOTFILE_NOT_VALID

Persistent snapshots require activation metadata available early in the volume-online path within the ERROR_VOLSNAP_BOOTFILE_NOT_VALID workflow. Record support-file size, number of snapshots and expected metadata demand when ERROR_VOLSNAP_BOOTFILE_NOT_VALID is returned. Resize or recreate the support mechanism through supported snapshot management; replacing the file blindly can orphan snapshots whose identifiers still exist when ERROR_VOLSNAP_BOOTFILE_NOT_VALID is returned.

Completion criteria

Preserve Volsnap and VSS evidence, correct the support-file capacity or activation bottleneck, and verify persistent snapshots across a complete volume-online cycle when ERROR_VOLSNAP_BOOTFILE_NOT_VALID is returned. For ERROR_VOLSNAP_BOOTFILE_NOT_VALID, apply the change through the supported storage API, then close and reacquire affected objects before retrying for ERROR_VOLSNAP_BOOTFILE_NOT_VALID.

• For ERROR_VOLSNAP_BOOTFILE_NOT_VALID, the first retry uses newly enumerated identifiers rather than cached handles for ERROR_VOLSNAP_BOOTFILE_NOT_VALID.
• The durable metadata or provider state agrees with the success returned after ERROR_VOLSNAP_BOOTFILE_NOT_VALID.
• A second run after close/reopen does not recreate the rejected ERROR_VOLSNAP_BOOTFILE_NOT_VALID condition.
• For ERROR_VOLSNAP_BOOTFILE_NOT_VALID, the nearby ERROR_VOLSNAP_ACTIVATION_TIMEOUT path remains separately testable and separately logged.

A reboot, blanket disk conversion or deletion of storage metadata is not a justified first response to ERROR_VOLSNAP_BOOTFILE_NOT_VALID; it changes multiple invariants and can erase the evidence needed to identify the defect for the ERROR_VOLSNAP_BOOTFILE_NOT_VALID request.

Technical references

• Microsoft: Volume Shadow Copy Service — primary API or object-model reference for the ERROR_VOLSNAP_BOOTFILE_NOT_VALID boundary.
• Microsoft Open Specifications: VSS snapshot attributes — use this source to verify volsnap state and parameters for ERROR_VOLSNAP_BOOTFILE_NOT_VALID.
• Microsoft: VSS backup components — documents the supported management path relevant to ERROR_VOLSNAP_BOOTFILE_NOT_VALID.
• Microsoft: COM error codes for VOLSNAP — defines the volsnap objects used to interpret ERROR_VOLSNAP_BOOTFILE_NOT_VALID.

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