is sata 2.0 the same thing as sata 3.0 gb/s

Yeah, from what I know, considering SATA is 1.50 Gb/s, SATA2 would be 3.00 Gb/s, or SATA 3.00 GB/s.
 
It means it is not the same.
The 3Gb/s capability is just one of many defined by the former SATA II committee, but because it is among the most prominent features, 3Gb/s has become synonymous with SATA II. Hence, the source of the confusion.
 
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