IOCTL_STORAGE_GET_DEVICE_NUMBER IOCTL (winioctl.h)

Retrieves the device type, device number, and, for a partitionable device, the partition number of a device.

To perform this operation, call the DeviceIoControl function with the following parameters.

BOOL DeviceIoControl(
  (HANDLE) hDevice,                 // handle to device
  IOCTL_STORAGE_GET_DEVICE_NUMBER,  // dwIoControlCode
  NULL,                             // lpInBuffer
  0,                                // nInBufferSize
  (LPVOID), lpOutBuffer,            // output buffer
  (DWORD), nOutBufferSize,          // size of output buffer
  (LPDWORD) lpBytesReturned,        // number of bytes returned
  (LPOVERLAPPED) lpOverlapped       // OVERLAPPED structure
);

Remarks

The values in the STORAGE_DEVICE_NUMBER structure are guaranteed to remain unchanged until the device is removed or the system is restarted. It is not guaranteed to be persistent across device restarts or system restarts.

Requirements

   
Minimum supported client Windows XP
Minimum supported server Windows Server 2003
Header winioctl.h (include Windows.h)

See also