Wow! Thanks for the abundance of responses. I am thankful and have learned much. I'm still thinking of going RAID-0 as there seem to be some pretty good deals on 60 and 80 GB drives out there and I like the thought of making a fast 140 or 160GB volume. Of course these are often IBM 120GXP (I think) closeouts and now I have to also ask: Has anyone here yet experienced any of the rumoured problems with this line of drives? Regarding heat: just out of curiosity, has anyone here installed any sort of third party "fan card" in their tower Macs? Thanks, Alex