Raid is a tricky, but very cool world.
First of all, for raid to work properly, you need to start with disks that are identical - The link you provided wont be of any use to you.
Stepping past that, let me explain what the benefits/drawbacks are.
Raid 0 is called 'striping' - You need at least 2 identical disks - Any piece of data thats written to the disk is divided up and written to both disks. Subsequently, any reading of files works the same way. If you load a map, ots loading off both disks at once, and you are getting roughly 2x the 'read' (loading) speed. Awsome huh? Drawbacks - One disk breaks, you lose ALL your data.
Raid 0+1 This adds a 3rd and 4th disk (Identical to first two) - The striped data works as per above, but each of those two disks as a backup. Its ****ed hard to lose data
(but your total drive capacity is only half of the 4 disks totaled up - 4 x 120 disks would net you 240gb storage capacity)
Raid 5 would allow you to use 2 striped disks, plue one for 'parity' - If one of the primaries fails, that 3rd takes over.
And on and on
Its expensive for a game machine, but the perfromance is insane
Linear Mode
