OK I FIGURED OUT HOW to mod the old maps and how to makew my own cd of halo 2 also. but the only porblem is i dunno which type of blank dvd to buy. theres like dvd+ and dvd- cd's. and i cant ask the uy in the store cuz the first thing the guy in the store said to me was i cnt burn xbox games.
If your gonna make a halo 2 backup with only multiplayer maps, then you can use a CD-RW, xboxes won't usually read CD-R media. Otherwise I would use a DVD-R, most all xboxes can read DVD-R media.