Super summary of these RAID types.

[wallabing]

So from learning about raid, are these right?

RAID 0 - Combine two or more hard drives together, making them into one big one, which also may make them go faster.

RAID 1 - Two or more hard drives duplicate each other exactly at all times.

 

[Nodsu]

Well, most RAID levels combine many hard drives together to make them look like one or many bigger ones.

It's more like:
RAID0 - spread data across all drives evenly for faster read/write.
RAID1 - two hard drives duplicate each other. Faster read times come as a bonus.

 

[Blakhart]

A more technical overview of raid arrays:

http://www.storagereview.com/guide2000/ref/hdd/perf/raid/levels/index.html