I have the Maxtor Diamond Max Plus 40 30GB hard drive and it totally rocks. I got it a few months ago at CompUSA for $199. At the time it was a pretty good deal. The drive is great. There is a noticeable difference between 7200rpm and 5400rpm. It's ATA66 or UDMA66 that is a rip off. That is only saying the cache has a burst speed of 66 mb/s. There is less than 5% difference between the normal drives. Fortunately most large capacity hard drives (namely good quality) have at least 2MB of cache and if you have a new motherboard you might realize the potential, but it's not really a great selling point from a tech stand point. Good luck. It's a great price on arguably one of the best IDE hard drives ever made. Also the Maxtor warranty is sweet, you get an advance replacement for a defective drive. That's a benefit of a top class corporation.