public static extern bool DeviceIoControl( Microsoft.Win32.SafeHandles.SafeFileHandle hDevice, uint IoControlCode, IntPtr InBuffer, uint nInBufferSize, ref DiskGeometry OutBuffer, int nOutBufferSize, out uint pBytesReturned, IntPtr Overlapped );
public static bool GetDriveGeometry(SafeFileHandle hDevice, ref DiskGeometry pdg)
{
uint junk; // discard results
return Native.DeviceIoControl(
hDevice, // device to be queried
Native.IOCTL_DISK_GET_DRIVE_GEOMETRY, // operation to perform
IntPtr.Zero, 0, // no input buffer
ref pdg, Marshal.SizeOf(pdg), // output buffer
out junk, // # bytes returned
IntPtr.Zero); // synchronous I/O
}
public static long GetDriveLength(SafeFileHandle hDevice)
{
DiskGeometry pdg = new DiskGeometry();
if (GetDriveGeometry(hDevice, ref pdg))
{
Console.WriteLine(pdg.Cylinders + " " + pdg.TracksPerCylinder + " " + pdg.SectorsPerTrack + " " + pdg.BytesPerSector);
return (long)pdg.Cylinders * (long)pdg.TracksPerCylinder *
(long)pdg.SectorsPerTrack * (long)pdg.BytesPerSector;
}
else
throw new Win32Exception();
}