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I've got a Dell e6400 laptop. Would a SATA II drive be compatible?

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in a word, yes.

SATA II drives are backwards compatible.

Wiki

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ok, thanks Would the SATA II version of the same drive perform any better in my e6400? – alex Nov 14 '09 at 11:18
    
no, if your controller only supports 150 MB/s, then that's it. – Molly7244 Nov 14 '09 at 12:57

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