NTSTATUS
FstubGetDiskGeometry(
  IN  PDEVICE_OBJECT DeviceObject,
  IN  PINTERNAL_DISK_GEOMETRY Geometry
  );

Routine Description:

    We need this routine to get the number of cylinders that the disk driver
    thinks is on the drive.  We will need this to calculate CHS values
    when we fill in the partition table entries.

Arguments:

    DeviceObject - The device object describing the entire drive.

Return Value:

    None.