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STATUS_LOST_WRITEBEHIND_DATA
Buffered data was lost during delayed write-back
A buffered write can return to the application before dirty cache pages reach stable storage. This status means a later flush failed and Windows could not save all data for the file. The application must not assume that an earlier successful write call made the data durable.
Preserve the affected file and surrounding event records. Determine whether the failure came from local media, a controller, removable storage, or a network path. Retrying unrelated writes can overwrite recoverable state and does not reconstruct the lost buffer contents.
What to inspect
- Record the file path, first failure time, and storage path.
- Check explicit flush results and application durability assumptions.
- Save to a known-good destination and restore from a verified source if needed.
References
- Microsoft: troubleshoot delayed-write failures
- Microsoft: FsRtlLogCcFlushError
- Microsoft: file buffering
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