Mac Pro Quad 2.66 5 gigs of ram Scratch 1 set to an emptry Raptor 10,000rpm drive. With this setup, I am really not hitting the scratch disk ever. I have PS set to use 2.5 gigs of ram, and I believe after that if it needs scratch disk, it writes to the remaining 2.5 gigs of ram before the actual disk, am i right? That being said, I have read that have 1 large scratch disk all to PS is better than having multiple scratch disks. Right now, I have the 150gig raptor empty, used only for scratch, and also a 75 gig partition on another drive, but I don't use it. With as much ram as we can get nowdays, what is the best setup for scratch disks, especially when using web-sized files?