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ERROR_FT_DI_SCAN_REQUIRED
A data-integrity scan is required before writes can resume
ERROR_FT_DI_SCAN_REQUIRED is a Win32 result associated with fault-tolerant or redundant storage. When ERROR_FT_DI_SCAN_REQUIRED is returned, diagnosis should begin with the exact API, target object, and operation that produced it rather than with the message text alone.
What the result means
Writes are blocked until a data-integrity scan reconciles mirrored or redundant copies. For ERROR_FT_DI_SCAN_REQUIRED, the practical meaning depends on the caller and on whether the affected object is local, remote, removable, policy-managed, or handled asynchronously. Diagnostics for ERROR_FT_DI_SCAN_REQUIRED should retain its symbolic name, numeric value, and the operation name together.
What to check
- Check storage health and identify which copies are out of sync.
- Run the supported data-integrity or repair scan.
- Monitor scan progress and review storage event logs for the original fault.
- Avoid forcing writes that could make replicas diverge further.
Recommended handling
Keep the volume protected until reconciliation completes. Afterward, verify redundancy and data integrity rather than assuming that write access alone proves recovery.
Developer notes
Code handling ERROR_FT_DI_SCAN_REQUIRED should capture the failing API, resolved path or device identity, requested access, process identity, and the first observed error. After a call that reports ERROR_FT_DI_SCAN_REQUIRED, read GetLastError() immediately because later cleanup or logging can overwrite the value. Retry ERROR_FT_DI_SCAN_REQUIRED only when the specific condition is documented as transient, using a bounded delay and cancellation support.
References
- Microsoft: System error codes relevant to ERROR_FT_DI_SCAN_REQUIRED
- Microsoft: File management context for ERROR_FT_DI_SCAN_REQUIRED
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