It's like this: Microsoft are idiots. The DRM thing for the 360, the many flawed PC operating systems, and my personal favorite: continuing to charge my credit card for Xbox Live AFTER I called and had the auto-renew cancelled when I got laid off. I was actually told the first time I called that it wasn't set for auto renewal, and that my gold account would automatically revert to Silver on Dec.1, 2007. After they tried to charge me in December, I called, was polite, and they hung up on me. After 3 months, they finally suspended my Gold account, which I refuse to pay for, since it was their damn mistake.
Anyway, back on topic. I thought the DRM was tied to the hard drive, because I can take my HD, put it on my friends 360, and still use all my downloaded content, except XBLA games, which I don't have any of.