Check this out, if you follow their advice, they say get the 7200 RPM drive. But of course the benchmarking is done on a PC, so Mac results may vary. http://www.tomshardware.com/mobile/20031031/index.html In terms of the heat aspect though, to me it hasn't been overly noticeable, so I think its in my head. With a faster drive, disk access time is shorter, and higher quality drives will generate less heat than competitors. I think the 7k60 is a good replacement(if it fits), but I can't say for sure, since my ibook doesn't have one, only my pc..... Al --- You wrote: Hmmmm maybe i'd better stick with the 5400rpm Richard --- end of quote ---