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[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError=true)]
internal static extern SafeFileHandle CreateFile(string lpFileName, int dwDesiredAccess, int dwShareMode, IntPtr lpSecurityAttributes, uint dwCreationDisposition, uint dwFlagsAndAttributes, SafeFileHandle hTemplateFile);

internal const int GENERIC_READ = unchecked((int)0x80000000);
internal const int OPEN_EXISTING = 3;
internal const int FILE_ATTRIBUTE_NORMAL = 0x80;

const int blockSize = 512;

FileStream ReadRAW()
{
   //Alternativen für logische LW/Part: http://support.microsoft.com/kb/q100027/
   var h = CreateFile("\\\\.\\PhysicalDrive0", GENERIC_READ, 0, IntPtr.Zero, OPEN_EXISTING,    FILE_ATTRIBUTE_NORMAL, new SafeFileHandle(IntPtr.Zero, true));
   
   if (! h.IsInvalid ) 
   {
      return new FileStream(h, FileAccess.Read);
   }
   else
   {
      throw new Exception(Marshal.GetLastWin32Error().ToString());
   }
}