[kosmiq]

The thing is not wether the drive can read the disc or not. Rather the fact that the xbox can execute unsigned code without modding.

Whenever you create a backup of a game the encryption of the disc becomes invalid. Thats why you need a chip or softmod that will fool this encryption and make the game run.

Changing reader will only result in that the drive can READ all format but NOT USE them. Music, originial games and original DVD's will work fine though.

So changing DVD-reader will not let you play backups, rather make backups more compatible if the xbox is chipped or softmodded.

I hope that was a little more clear and explained it better to you.