Whats the difference between SATA and SATA2?

ADE

banned
OK, I've herd of them, and yes, I believe SATA2 is better, but I've never had a SATA2...So what makes them different and how much better can a SATA2 be than a SATA. WD Raptor doesn't even use SATA2. But most of all, is SATA2 backwards compatible?
 
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