What do you mean,.. buy a xsata or xport ( if you dont have any money get a transfer cable from Microsoft for free). Download a gametype modding program, and finally get a resigner and rehasher..... click some buttons, and walah youve modded a gametype!
Ok So open DOSBOX and type in Z:\>MOUNT C C:\Where your games are located here and then after its mounted to your drive type in the name of the game such as DOOM. ^___^ if you have any more questions just post here.