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STATUS_VERIFY_REQUIRED
Media-change verification is a gate, not a surface scan
STATUS_VERIFY_REQUIRED belongs to the media-change path. After Windows detects that the medium has changed, the device can enter a verification interval. During that interval, ordinary reads and writes are deliberately prevented while the verify-related I/O is allowed to proceed.
Do not confuse this state with a request to run a full bad-sector scan. The status describes serialization around media verification. The first evidence to preserve is the media-change or unit-attention sequence and the request that triggered verification. In a storage stack, the class driver can interpret protocol-specific sense information and determine how the request should be handled.
Repeatedly issuing normal I/O while verification is active only reproduces the gate. The diagnostic split is between a verify operation that is legitimately still running and a verify path that never reaches completion because of device, media, or transport errors.
What to inspect
- Media insertion, removal, changer activity, or virtual-media replacement immediately before the status.
- The sense data or bus-specific media-change indication that caused verification to start.
- Whether the verification request completes and whether subsequent ordinary I/O is released.
References
- Microsoft: Windows storage driver architecture
- Microsoft: Interpreting storage sense data
- INCITS T10: SCSI ASC/ASCQ assignments
- Microsoft Open Specifications: NTSTATUS values
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