With the hdd i did a test on my xbox 360 and when i put a another hdd it put the version of when the console of the hdd so maybe you can use the hdd of xbox 360 and put a modded firmware and after you put the hdd it put modded firmware and before you all say "yes but it stupif you can't" its not...
@The Real Jdbye, I thought about that and I have blank DVD's and Blurays but honestly after like 90 songs I just listen to it a couple of hundred times toss it out and burn something else or have like 2-3 CD's. Florida here the heat in the car tends to ruin the CD's after like a few months even commercial pressed ones don't last too long.