16mb cache

what are the differences between 1TB Hard disks of the following descriptions:a) SataII, 5400rpm, 64MB cache; and, b)SataII, 7200rpm, 16MB cache?
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  1. "a" is clearly a "green" drive with 48 mb more cache, slower access times, quieter, and probably lower power consumption.

    This is assuming that all other factors such as platter size are equal, and they probably are not.
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