quite HDD question :)

the difference between sata and sata2 is that sata2 theoretically transfers twice as fast, in reality this is not an issue as transfer speeds are severely bottlenecked by the drives themselves. There will be a slight difference between sata and sata2, but you won't notice it empirically. It also matters whether or not your mobo supports sata2 speeds. Sata2 is backwards compatible though, so if you have components that are mixed sata and sata2 you shouldn't have any problems
 
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