[Electrofreak]

Yeah, 'cause if one of the drives fail... you are screwed :-\
RAID 0+1 (from what I can remember) is like running 2 RAID 0 arrays in a RAID 1 array. Basically, you are running a striped array (RAID 0), along with another array that mirrors it (RAID 1). So, not only do you have the high speed of a RAID 0, but you have the reliability of a RAID 1 if one of your drives fail (because it just uses the working RAID 0).

Get it? So, take a RAID 0, and mirror that, and thats a RAID 0+1. This of course requires 4 drives or more (2 for the RAID 0, and 2 to mirror it as RAID 1). It gives you the nice read/write speeds of having a RAID 0, and coupled with the reliability of RAID 1. Expensive tho.