what does sata 2.0 mean

Did you read the article? Here it is for you:
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.

For an accurate description of Serial ATA capabilities and the official guideline to SATA product naming, please see the details below.


There's even a chart that explains the different hardware and the speeds they'll be able to produce. Go ahead, take another look.
 
i believe SATAII is backwards compatible with SATA150
yes it is

amoung the undecided advances it will featuse a 3GB transfer rate
Well that it true, but that alone prob wont make a huge difference to performance, most hardrives dont make use of the 150MB/sec that sata150 provides (talking sustained throughput here not burst rate)
There are some other good features of Sata II, but the best is
1)native command queuing (NCQ), a few versions of which are out on some of the wd raptors
2)You can put more drives on one channel (this may be were the 3gb bandwidth is useful)
3) Ooww the cables can be longer :)
There are a few other benefits, but most are not of huge use to desktop users
 
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