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| ERROR_UNRECOGNIZED_VOLUME | ERROR_FULLSCREEN_MODE |
ERROR_FILE_INVALID
the volume for a file has been externally altered so that the opened file is no longer valid.
ERROR_FILE_INVALID means that an open file handle no longer refers to a valid object because the underlying volume changed outside the handle’s assumptions. In this case, the decisive context is removable media replaced while a file remains open, together with file path, volume serial/identity, handle open time, and failure time.
Where the result appears
- removable media replaced while a file remains open.
- volume dismount, remount, restore, rollback, or snapshot transition.
- cluster, virtual disk, or storage failover that changes the presented volume.
- administrative repair or imaging operations performed during application access.
Typical causes
- media was swapped or the volume identity changed.
- the filesystem was repaired, restored, or replaced under an existing handle.
- a storage provider invalidated cached file state.
- the device was reset or re-enumerated and old handles became stale.
Evidence to collect
- file path, volume serial/identity, handle open time, and failure time.
- device arrival/removal, mount-manager, storage, and filesystem events.
- whether the application watches for media or volume changes.
- operations by backup, snapshot, failover, repair, or virtualization software.
For this condition, begin the investigation with file path, volume serial/identity, handle open time, and failure time. Correlate it with device arrival/removal, mount-manager, storage, and filesystem events and check whether media was swapped or the volume identity changed. Capture the original this result immediately after the failing call so later cleanup does not replace the thread-local error value.
Handling and recovery
Close the stale handle, rediscover the intended volume, verify its identity, and reopen the file. Do not assume that the same drive letter or path now names the same media. For writes, revalidate file version and transaction state before resuming.
Any retry policy for it should be tied to evidence that the filesystem was repaired, restored, or replaced under an existing handle has changed. Before another attempt, verify whether the application watches for media or volume changes. If the device was reset or re-enumerated and old handles became stale still applies, stop the retry sequence and preserve the first diagnostic event.
Common misinterpretation
The code does not necessarily mean that the file contents are corrupt. It means the existing open-handle context can no longer be trusted.
Guidance for developers
When surfacing this result through another layer, retain its Win32 domain, numeric value, and the operation described by volume dismount, remount, restore, rollback, or snapshot transition. A useful telemetry record also includes operations by backup, snapshot, failover, repair, or virtualization software. For an-related handling, decisions must use the numeric value and documented API contract rather than localized wording.
A focused test should reproduce the condition in which a storage provider invalidated cached file state, assert this result, and confirm that the program releases resources associated with cluster, virtual disk, or storage failover that changes the presented volume. The recovery test should also verify that file path, volume serial/identity, handle open time, and failure time is refreshed before the operation resumes.
References
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