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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.
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.
Official references
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