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SATA II Misnomer
The 3.0 Gbit/s specification has been very widely referred to as “Serial ATA II” (“SATA II” or “SATA2“), contrary to the wishes of the The Serial ATA International Organization (SATA-IO) which defines the standard.
The term SATA II has grown in popularity, causing great confusion with customers because, quite simply, it’s a misnomer.
The first step toward a better understanding of SATA is to know that SATA II is not the brand name for SATA’s 3Gb/s data transfer rate, but the name of the organization formed to author the SATA specifications. The group has since changed names, to the Serial ATA International Organization, or SATA-IO.
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.
Probably more than you wanted to know. :p Think about how older EIDE and PATA133 are interchangeable but older stuff isn't as fast. In your case, older stuff should transfer at exactly half the speed.