15,000 rpm 147gb hard drive 8)
http://zipzoomfly.com/jsp/ProductDetail.jsp?ProductCode=100563-1
Like the Raptor, the SCSI drive would improve general system performance far more than the effect it would have on games. But of course not only are the SCSI drives more expensive themselves, unless you have an enterprise-class board with onboard SCSI you'd need to spend even more on the addon card... Trust me I tried, and it's not worth it.
I just moved over to SCSI 15K and it screams in Windows, even faster than my Raptor, which was noticeably faster than my old 7200 drive. Windows loads faster, games load faster and as has been mentioned all those little file accesses just happen a lot quicker.
My set up is cheap too - an old PCI U160 card, cable, adaptor and new Fujitsu 73GB MAX3073NC drive came in at less than a 74GB Raptor.
So SCSI can be good value if you shop around (thanks ebay!).
But anyone thinking of moving to Raptors or SCSI had better be prepared for a loud seek noise - they sound like a couple of coffee grinders under the desk
Haha, I got my Adaptec 29160 SCSI card from ebay too, and actually my Cheetah drive too. However, I installed Windows from scratch on it, and I installed Windows from scratch on my bro-in-law's PC which had a Raptor, and his was most definitely not in any noticeable way slower than mine. Mind you, both blow 7200rpm out of the water completely.
As for the seek noise, my Seagate Cheetah is WAY louder than the Raptor, dont know about your newer Fujitsu (mine was new, like 3 years ago when I got it!)