Error 0x00042577

Value: 271735 | 0x00042577 | 271735

What does it mean ?

VDS_S_DISMOUNT_FAILED  
Failed to dismount the volume after setting the volume flags.
Value: 9591 | 0x2577 | 0b0010010101110111

Where does it come from ?

FACILITY_ITF  
COM/OLE Interface management. FACILITY_ITF is designated for user-defined error codes returned from interface methods
Value: 4 | 0x004 | 0b00000100

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