Enlarges the specified partition.

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

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


You can extend or shrink a live partition, and the partition can be open for sharing during the extend or shrink operation.

You do not need to lock a partition that you are extending, nor do you need to shut down other applications or services during the extend operation.

For more information, see DISK_GROW_PARTITION.


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