That is correct, some would argue that RAID0 is not a true RAID array because it has zero fault tolerance. Sure, it is very fast, but can you imagine recovering from 4.7Gb DVDs............ you would have over 100 of them with the volumes of data you are talking

This is a supplier's site but has a pretty good basic explanation of the various types of RAID arrays:

http://www.acnc.com/04_01_00.html

There is a little bar near the top where you click for each type.