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VDS_S_FS_LOCK
This warning identifies an exclusive file-system coordination boundary. VDS format and volume-management workflows can need exclusive access so file-system metadata or volume state does not change underneath the operation. Microsoft's MS-VDS format contract explicitly attempts to obtain exclusive access and returns a device-in-use error when exclusive access cannot be obtained and force is not requested.
Why this state matters
VDS_S_FS_LOCK should therefore be investigated through volume use and the operation that required locking, not by treating it as an ACL error. Open files, mounted applications, filter drivers, or another storage operation can prevent a clean lock. Preserve the original operation and volume identity; forcing dismount or repeating the operation without understanding active users can cause data loss or application failures.
Diagnostic focus
- Identify the exact VDS operation that required the file-system lock and the target volume ID.
- Check active volume use and concurrent format, shrink, snapshot, or maintenance operations.
- Use force/dismount semantics only when the API documents them and the data-loss implications are understood.
- After the competing activity ends, requery volume state before retrying the operation that needed exclusive access.
Technical references
MS-VDS IVdsVolumeMF::Format · IVdsVolumeMF::Dismount · IVdsVolumeMF · MS-VDS error codes · VDS common return codes
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