I work of a school system that has for the most part all Mac computers! I do all repairs on the computers. I am working on a eMac (USB 2.0) it has a bad HD and I have tried 3 different new 7200 RPM 80GB HDs with no luck.It came with a 5400 RPM 40GB HD. I was told buy one of our suppliers that there head Tec repair person said that you can only use a 5400 RPM HD in these. Is that true and if so where is a good place I can find these cause I can not find them at a reasonable price. If not how can I make it work in my computers? confused