I just need to say this - take it for what you will.
Stop putting raids in your home systems unless you understand how they work, understand the risk/rewards of using them and more importantly understand how to recover them when they fail. Oh and they will fail, every raid fails.
Also if you really want to run raid, make sure you are backing up whatever is on the raid. Then when the raid fails (and it will fail) you can kill the raid, rebuild it and recover from your backup. Without having to mess around trying to rebuild a raid.
One more thing. If you are running a raid (again home systems) make sure you are running a seperate raid controller and doing hardware raid also. Onboard raid controllers suck for 2 reasons. One if the controller fails you can replace the controller not the whole motherboard and secondly they are typically more reliable and come with better tools to repair your raid - when it fails. If you are running software raid, well god help you.
Raid types. If you feel the need to run raid don't run raid 0. Simple as that. If you want reliability run Raid 1, if a drive fails basically no biggy. But know that raid 1 is primarily for redundancy and not speed. Raid 5, rather popular put in 3 (or more) drives loose 25% of your space and gain almost no benefit on a home computer because guess what - you are the only person using it so the data access is rather singular. You don't have a whole tone of multiple read/writes in the cue.
Pleas people I know I'm ranting but it's a lesson that many need to learn. Raids are ideal in the business world where you have high volume, highly accessed data stores they are also running on server class machines that are designed to do it.
Raid on your home computer not worth it.