VM_E_USB_ATTACH_FAILED_ALREADY_ASSIGNED

Code: 0xA0040933 (2684619059)

As HRESULT:

S: 1 (Failure)
C: 1 (Customer-defined)
N: 0 (Not an NTSTATUS value)
Facility: 0x004 (FACILITY_ITF: COM/OLE Interface management)
Code: 0x0933 (2355)

As NTSTATUS:

Sev: 2 (STATUS_SEVERITY_WARNING)
C: 1 (Customer-defined)
Facility: 0x004 (FACILITY_IO_ERROR_CODE: Input/Output)
Code: 0x0933 (2355)

Documented in Win32

HRESULT Codes Specific to Windows Virtual PC (vpccominterfaces.h): 0xA0040933

A USB device has already been attached by some other client.