/// <summary>
/// Supported on Windows XP and upward
/// </summary>
public static DISK_GEOMETRY_EX GetDiskGeometryEx(SafeFileHandle hDevice)
{
uint dummy;
DISK_GEOMETRY_EX diskGeometryEx = new DISK_GEOMETRY_EX();
IntPtr lpOutBuffer = Marshal.AllocHGlobal(Marshal.SizeOf(diskGeometryEx));
Marshal.StructureToPtr(diskGeometryEx, lpOutBuffer, false);
bool success = DeviceIoControl(hDevice, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX, IntPtr.Zero, 0,
lpOutBuffer, (uint)Marshal.SizeOf(typeof(DISK_GEOMETRY_EX)), out dummy, IntPtr.Zero);
diskGeometryEx = (DISK_GEOMETRY_EX)Marshal.PtrToStructure(lpOutBuffer, typeof(DISK_GEOMETRY_EX));
Marshal.FreeHGlobal(lpOutBuffer);
if (!success)
{
int errorCode = Marshal.GetLastWin32Error();
if (errorCode == (int)Win32Error.ERROR_INVALID_FUNCTION)
{
// Windows 2000 will throw this exception because IOCTL_DISK_GET_DRIVE_GEOMETRY_EX is only supported from XP onward
throw new InvalidOperationException("IOCTL_DISK_GET_DRIVE_GEOMETRY_EX is not supported");
}
else
{
string message = String.Format("Unable to retrieve disk geometry, Win32 Error: {0}", errorCode);
throw new IOException(message);
}
}
return(diskGeometryEx);
}
public static DISK_GEOMETRY GetDiskGeometryAndSize(SafeFileHandle hDevice, out long diskSize)
{
if (Environment.OSVersion.Version >= new Version(5, 1, 0, 0))
{
// XP and upward
DISK_GEOMETRY_EX diskGeometryEx = GetDiskGeometryEx(hDevice);
diskSize = diskGeometryEx.DiskSize;
return(diskGeometryEx.Geometry);
}
else
{
// Windows 2000
DISK_GEOMETRY diskGeometry = GetDiskGeometry(hDevice);
diskSize = GetPartitionSize(hDevice);
return(diskGeometry);
}
}
