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What is A SATA 3.0Gb/s Hard Drive

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it's confusing but 3GB/sec is the max data transfer rate.

SATA II is a specification. It's now called SATA-IO.

to make things more confusing, there is now SATA 2.5 specification.
 
Huh? Cause im looking on newegg for a sata II drive and they have Sata 150 and Sata 3.0gb
 
http://www.sata-io.org/namingguidelines.asp
Dispelling the Confusion: SATA II does not mean 3Gb/s

The term SATA II has grown in popularity as the moniker for the SATA 3Gb/s data transfer rate, 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.
 
then it should be obvious that instead of SATA I and SATA II they are listing them by the specs speed.

SATA I = 150
SATA II = 3.0
 
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