Most drives only average 40MB/s! It is a severe limitation on IDE! A raid setup is very nice since you could get a 200MB/s burst, but I am not sure what the average is. SCSI is real nice, but comes with a price. An u160 controller is 100+ dollars and drives are very pricey when compared to IDE. If you can afford SCSI or a dual IDE setup for raid then more power to you. Keep in my mind Raid does have drawbacks!