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STATUS_FLT_VOLUME_NOT_FOUND
STATUS_FLT_VOLUME_NOT_FOUND means that the volume identifier could not be resolved to a Filter Manager volume object at that moment. It does not prove that the physical disk failed, nor does it mean that a filter exists on a different volume.
Use a stable volume identity and account for mount and dismount races. Drive letters can be absent or reassigned, while a volume GUID path and a Filter Manager enumeration describe the object actually visible to the filtering stack. Refresh the volume reference instead of keeping an opaque pointer after a dismount boundary.
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- Volume not found: no current Filter Manager volume object matched.
- Instance not found: the volume exists, but the requested filter attachment does not.
- Deleting object: the object is known but teardown has already started.
Filter Manager API overview | Filter Manager concepts | NTSTATUS reference
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