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ERROR_LOST_WRITEBEHIND_DATA_LOCAL_DISK_ERROR
Delayed-write data was lost because a local disk or removable medium failed the write.
ERROR_LOST_WRITEBEHIND_DATA_LOCAL_DISK_ERROR means that delayed-write data was lost because a local disk or removable medium failed the write. Dirty cached data could not be committed to local storage. The cause may be device removal, write protection, media failure, controller reset, file-system corruption, or a device reporting an I/O error after the application’s buffered write returned.
Where the result appears
- USB or removable media removed before safe ejection.
- local disks that develop I/O errors during cache flush.
- write-protected media receiving queued writes.
- storage stacks recovering from controller or bus resets.
What the result tells you
The value identifies a specific Windows state, but it does not by itself identify the component that introduced that state. Preserve the original this result value, the API or subsystem that produced it, and the object being operated on. A wrapper that replaces it with a generic exception or Boolean failure removes the distinction needed to choose the correct recovery path.
Diagnostic evidence to collect
- device instance ID, volume, physical disk, and storage path.
- Disk, StorPort, NTFS/ReFS, and Kernel-PnP events at the same time.
- SMART or vendor health data and controller diagnostics.
- the final file size, checksum, and whether the medium was removed or locked.
Correlate the result evidence on one timeline. The first event that changes the state associated with this result is usually more valuable than later retries returning the same code. Record process and thread identity, session, timestamp, API parameters, and the immediately preceding successful operation.
Handling and recovery
Stop using the affected output as valid. Reconnect or replace the medium, clear write protection only when intended, run storage diagnostics, and write a fresh verified copy. On a fixed disk, prioritize backup because delayed-write loss can be an early sign of hardware or file-system failure.
Retry after this result only when the evidence shows that an external condition can change. When it is caused by malformed input, revoked authority, unsupported state, hardware damage, or an offline maintenance requirement, an unchanged retry adds noise and can overwrite the earliest useful diagnostics.
Common misinterpretation
The data-loss message can appear after the original write call, so searching only the call site that issued WriteFile may miss the actual flush or device-removal event.
Guidance for developers
Keep it in its Win32/LRESULT domain in structured telemetry. When converting it to an HRESULT, exception, RPC response, or JSON field, retain the source domain and numeric value alongside the human-readable text. Do not branch on the localized message string for it.
A it test should construct the specific state, assert the exact result, and verify that partial resources are released. The recovery test for it should prove that the operation is either deferred until a measurable state change or fails without an uncontrolled retry loop.
References
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