The specification for the second generation Serial ATA signaling speed - 3Gbps - has been completed and the release candidate of that specification has started its ratification process. The second-generation speed of 3Gbps (300MB/s) is double that of the first-generation Serial ATA speed which is 1.5Gbps (150MB/s).
http://www.amtdrt.inlumen.com/bin/story ... teXyJa2mdy