SATA or SATA2

SATA2 interface is twice as fast as SATA, however no HD can use up all the bandwidth of even SATA so performance-wise SATA2 has no significant advantage atm. I think there's some other extras that come with it... anyway, SATA drives are backward&forward compatible (with some exceptions of course), furthermore just about every new MoBo has SATA2 and all HDs are SATA2 as well, so this really wouldn't matter...
 
josephe said:
Can somebody explain me that what is the difference between the SATA and the SATA2???
Click to expand...

Sata=150mb/s and Sata2=300mb/s, But Sata and Sata2 drives still have a hard time even hitting Sata speeds of 150mb/s, Sata2 are probably faster at burst speeds. Technically is not Sata and Sata2, its Sata 1.5 and Sata 3.0
 
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How is it you go from 3.0 Ghz to 300 megabytes per sec?

I keep landing at 375 MB/sec

3000000000/8 = 375000000
 
As stranglehold said, the true name of SATA 2 is SATA 3.0, because it runs at 3 Ghz. But I cannot get 3 Ghz to give 300 megabytes
 
Nothing about a Hard Drive is measure in hertz. Where are you getting 3 Ghz from? 300 MB is the max transfer rate of a SATA2 drive, though as already mentioned, it's basically fluff at this point due to current transfer speed limitations being considerably less than that max. I'm still not understanding what you're asking.
 
Actually, it's called such since the transfer rate is either 150 MB/sec or 300 MB/sec.

I'm not trying to start a flame war with you, I'm just curious as to whether you're asking a valid question (which I think is the case) and I'm just not getting it, asking a question that makes no sense, or if you're just trying to provoke something (which I don't believe is the case). No harm, no foul - I'm just trying to understand the question that appeared seemingly out of the blue:)
 
It is true that the raw speed of the interface is given in Ghz. There is a 20% overhead in the transfer protocol, so remove that: 375*0.8=300

To clarify: in the specs for SATA, the speed is given in gigabits (Gb) per second. So 3Gb/s gives 300 MB/s after the encoding overhead.
 
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Like said you have to subtract the overhead of the physical layer. Sata 1.5 is really 1.2 Gbps and Sata 3.0 is really 2.4 Gbps. For the name Sata II, it was the name of the body that developed the SATA/300 specification. It has changed its name to SATA-IO.
 
The interface has a clock of either 150Mhz or 300Mhz. On each clock, the bus is sampled 10 times. So the bus is sampled 1,500,000,000 or 3,000,000,000 times each second.

Each sample provides a single bit, and therefore the specs says 1.5Gb/s for first generation and 3.0Gb/s for second generation of SATA.

So saying the interface is running at 3Ghz is not that far fetched.
 
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