I just added a Seagate 500gb drive to my C2D build. I got owned on it though, I thought it was going to fit in the floppy bay. Well it does, just not with the fan that I intended to use. So I had to put it on it's side. So altogether, I'm running 73gb Raptor -10k 150gb Raptor - 10k 73gb scsi - 10k 500gb Seagate - 7.2k In a 14"x14" micro-atx case.