Much better DAE, and disk compatibility. I RMA'd mine 2 weeks ago... cost me $5 on top of $120 already wasted on this drive that took over 4 hours to install WindowsME, and wouldn't read the Road Runner installation disk. I still haven't got a return, so you can add bad Customer Service and Tech Support to the list. (Tech support assumed it was my problem and they sounded like a stoner on the phone). After the 52x Kenwood should have learned a lesson, but while they haven't I have.