This is nothing new to me. I built my AMD XP 2500 system with an IBM 36Z15 18GB drive as my system drive, and this 15,000 RPM screamer really makes disk access seem instantaneous. I'm only using an Adaptec 2940UW controller, instead of a more costly SCSI 160 controller, so its 40 MB/sec transfer rate does slow the data transfer. But on a single-user system the higher 160 burst speed isn't so important, and the sustained disk to buffer transfer rate is only 40-60 MB/sec, meaning the 2940UW does a pretty good job of keeping up.