SATA Hard drives

Hello all,
I purchased a Seagate Barracuda 200GB SATA about 6 months ago and now I want to buy another. I've heard to use RAID 0 I need to pruchase the EXACT same harddrive. Is this true?

I've found the same hard drive but it is 7200.8 whereas mine is 7200.7 would this make any difference?

Thank you for your time guys.

 

 

 

 

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