One is 7200 RPM with 32mb cache and the other 5400RPM but 64mb cache. I believe the "slower" 5400 RPM is actually the newer seagate generation of hybrid drives and is being touted as faster. But I'm not sure. Thanks.
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More abouthard drive faster 5400rpm sshd 7200 rpm sshd
the Seagate Momentus XT is a bit faster, but the one you linked is a refurbished drive mind you.