Retrieves extended information for each entry in the partition tables for a disk.

To perform this operation, call the DeviceIoControl function with the following parameters. You must have read access to the drive in order to use this control code.

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


This operation retrieves information for each primary partition as well as each logical drive. To determine whether the entry is an extended or unused partition, check the Disk Partition Types.


Requirement Value
Minimum supported client Windows XP [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Header winioctl.h (include Windows.h)

See also