What does HRESULT 0x00042578 (VDS_S_REMOUNT_FAILED) mean?

 
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VDS_S_DISMOUNT_FAILED VDS_S_RESYNC_NOTIFICATION_TASK_FAILED

VDS_S_REMOUNT_FAILED

This warning describes the later half of the flag-transition cycle. Setting HIDDEN or READONLY can force VDS to dismount and then remount the volume. VDS_S_REMOUNT_FAILED means the flag operation progressed past the dismount boundary but VDS could not restore the mounted state afterward. The resulting volume may therefore have new flags and a different accessibility state.

Why this state matters

The correct response is state reconciliation, not immediate repetition of SetFlags. Query current flags, mount/offline status, and access paths. IVdsVolumeMF::Mount is the documented mount operation, while a permanently dismounted volume follows a different lifecycle in which adding an access path can bring it online.

Diagnostic focus

  • Requery volume flags and determine whether the requested attributes were applied before remount failed.
  • Inspect current mount/offline status and access paths instead of testing only a drive letter.
  • Preserve provider and file-system events from the failed remount interval.
  • Remount only after verifying the intended flag state; do not blindly repeat the entire flag transition.

Technical references

IVdsVolume::SetFlags · IVdsVolumeMF::Mount · IVdsVolumeMF::Dismount · VDS_VOLUME_FLAG · MS-VDS error codes


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