Error 0xC038001A

Value: -1070071782 | 0xC038001A | 3224895514

What does it mean ?

ERROR_VOLMGR_EXTENT_ALREADY_USED  
The specified extent is already used by other volumes.
Value: 26 | 0x001A | 0b0000000000011010

Where does it come from ?

FACILITY_USERMODE_VOLMGR  
User mode volume manager
Value: 56 | 0x038 | 0b00111000

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