On Wednesday, January 15, 2003, at 09:27 AM, b1ywov85 wrote: > .the pc was simply not designed for that speed of HD..or > better put..the extra heat generated by it..he said it may work > now..but it > will overheat...sooner or later. The older iMacs have a fan. I upgraded the HD 6 months after getting the 333 iMac. They came out in summer 1999. Never had a problem with that machine. I guess there must be a website dedicated to HD running temps. I will take a look later this evening. Another related subject would be keeping the interior of your clean. Dirt and fuzz makes a computer run hot, so those with pets might think twice about upgrading. I have taken hundreds of machines apart and am amazed at how much filth collect in some cases. I think those with cats and those that smoke have the most build up. groucho