Years ago I was messing around with Windows MBR (on VXHeaven) and got stuck while trying to write a modified copy back to the disk.

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[code]
using System;
using System.Runtime.InteropServices;
using Microsoft.Win32.SafeHandles;
using System.IO;

namespace MBR
{
class MainClass
{

[DllImport("Kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
static extern uint SetFilePointer(
[In] SafeFileHandle hFile,
[In] int lDistanceToMove,
[Out] out int lpDis