I am aware that I can take apart my old xbox hard drive and use it on the new xbox slims. I know its risky but Im sure I can do it. Once I get it istalled, will the slim be backwards-compatible with original xbox games? e.g Halo and Halo 2? Also, I heard features of Halo Reach require a HDD. Will I be able to play firefight and other play modes using my old xbox's HDD on the slim? Thanks in Advance!