What is the difference between SATA 6gbs and SATA-300

What is the difference between the Western Digital SATA 6Gbs and the Western Digital SATA-300? They are both the same price but I would like the more efficient and faster one.

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  1. No practical difference for hard drives. SATA 6GBit/sec has twice the theoretical transfer rate of SATA 3Gbit/sec, but the real-life transfer rate is limited to much, much slower than that anyway by the data density and rotation rate of the drive's platters.
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