Wee raid0 question.

[Vegeta]

Hi, I currently have a WD 250GB Sata 2 16mb 2500KS HDD.
I was thinking of getting another and running in raid0.

I've got a couple of question.

1, To run raid 0, both drives have to be identical?
2, This hard drive is full of data and I dont want to back everything up on DVD, if I install both drives on raid0 will i need to wipe this first?
3, If I run raid 0, can I still seperate both the drives in windows, having one as files and the other as the OS?

 

[Vegeta]

So if I were to somehow backup all my 250gig data (lol what a pain), then get these under raid0 then partition them into two drive, I will see a large speed increase?

I also overclock a lot an experiment, sometimes when I oc my pc might crash, under raid 0 if this happens will I lose all my data? I dont lsoe data when I do this on one hard drive.