Raiding for an Explanation of RAID Page 5
It should be noted that RAID 1 arrays do not differ greatly from single disks in terms of performance. In fact, RAID 1 typically incurs a tiny performance hit, but not enough to worry about. In any case, the main focus of RAID 1 is reliability, not speed. There are, however, no hard and fast numeric reliability benchmarks.
While RAID won't benefit everyone, it will some. Those who want a RAID platform but are put off by the cost of SCSI, IDE RAID may suit perfectly. Iwills sIDE RAID66 is an excellent contender, performance is top-notch, and quality and reliability are excellent. And at only $99 MSRP (likely cheaper street prices), it won't leave your wallet dry.