I couldn't find an exact answer to this question. I have a dual-tuner Series2 and swapped out the 80GB IDE drive for a 250GB SATA drive with an adapter. Everything looked to be working fine but then I started noticing that an occasional recording was truncated or split into two recordings. From what I've read here, it seems that the Tivo is resetting in the middle of the recording (about 5 minutes is missing so that seems plausible). I know that the drive is good and the adpater, while not a "recommended" one does work without any other known glitches. In the interest of eliminating a variable, I will probably just buy an older IDE drive but will I have issues if I try to record two shows at the same time if I don't get a drive that specifically allows that capability (an AV drive)?