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I remember a couple of years ago THG benchmarked SATA versus old ATA and both were the exact same speed. The cable allows faster bandwidth but in the end they're the same. What DOES make a difference is the fact that most newer and faster hard drives just happen to be the SATA interface. Fast because of the way they're built, not fast because they're SATA. Unless you buy a Western Digital Raptor (then it's the drive AND the SATA interface making it fast).
I've had good and bad drives of every HDD manufacturer and definitely have not noticed one being better than the other.
The older style non-SATA HDDs will work on your PC fine but there will be some configuring of the physical jumper on the hard drive depending on where you put it on the actual hard drive cable. SATA hard drives require no physical configuration, but you might have to install the SATA drivers onto your PC to make the HDD work in Windows. Either way it's an easy task.
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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