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IOCTL_STORAGE_READ_CAPACITY IOCTL (winioctl.h)

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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

Requirement Value
Minimum supported client Windows Vista
Minimum supported server Windows Server 2008, Windows Server 2003 with SP1
Header winioctl.h (include Windows.h)

See also