IOCTL_STORAGE_READ_CAPACITY IOCTL (winioctl.h)

Retrieves the geometry information for the device.

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

BOOL DeviceIoControl(
  (HANDLE) hDevice,             // handle to device
  IOCTL_STORAGE_READ_CAPACITY,  // 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 
);

Requirements

See also

• Device Management Control Codes
• DeviceIoControl
• STORAGE_READ_CAPACITY