So a bit ago I had to replace my HD for my G4 iBook because the stock drive decided to do the click-of-doom. So after a bit of online searching, I found the Hitachi 5K100 80 GB drive to be SWEET!! Its basically one of the fastest drives, fast access, and super quiet/low heat. The drive Runs like a dream, and is faster than the stock dirve. If you are looking into a drive I really recommend this one!