HRESULT 0xC038001A (ERROR_VOLMGR_EXTENT_ALREADY

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Description:

ERROR_VOLMGR_EXTENT_ALREADY_USED the specified extent is already used by other volumes.

Could be also:
Constant	Type	OS
STATUS_VOLMGR_EXTENT_ALREADY_USED	NTSTATUS	Windows

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ERROR_VOLMGR_DYNAMIC_DISK_NOT_SUPPORTED	ERROR_VOLMGR_EXTENT_NOT_CONTIGUOUS

ERROR_VOLMGR_EXTENT_ALREADY_USED

ERROR_VOLMGR_EXTENT_ALREADY_USED meaning

ERROR_VOLMGR_EXTENT_ALREADY_USED has value 0xC038001A. Windows Volume Manager rejected a request because the selected disk extent is already assigned to another volume or plex. The extent cannot be reused until its current membership is understood and intentionally changed.

Evidence to collect

Record the disk id, offset and length of the extent, dynamic-disk pack, volume and plex membership, and the exact operation that tried to claim it. Compare Disk Management, DiskPart detail output, and storage-provider inventory before making changes.

Preserve the exact API or command that returned this result, the caller identity, target object, complete numeric status, and the first component log that records the failure.
Compare the failing request with a working request for it at the same subsystem boundary before applying destructive configuration changes.

Recovery and retry

Do not clean, initialize, or overwrite the disk to force the operation. Remove or migrate the existing membership through a supported storage workflow, verify backups, and then retry with an unallocated extent.

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