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SATAII 3G vs SATAIII 6G Hard Drive Comparison

post #1 of 14
11/26/10 at 1:00pm
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I haven't tried SSD yet (I can't justify the cost per Gig factor) but I did get get the RIIIF MB because of the SATA6G and USB3 features. So I found a nice deal on a WD Black 1Tb hard drive and bought 2 of them.

For those of you wondering about how these drives scale (Good or Bad), here are my HD Tune results comparing SATA3G and SATA6G drives.


Here is my Seagate 500g SATA-2 (3G drive):





My WD Black SATA 3 (6G Single drive):





My 2 WD Black SATA 3 (6G drives in RAID0 Stripe mode):





I also tested one of my 6G drives on the SATA2 connection to see how it compared, the results were IDENTICAL to using the SATA3 connection! Yes I get RAID0 SATA2 speeds out of 1 SATA6G drive on a SATA2 connection! I don't understand why they call them 3Gb/s | 6Gb/s drives then?


I hope this answered some questions about SATA3G vs SATA6G hard drives. I know it did for me. Now I will probably split my 6G drives up based on this and use the 2nd drive on my P6T system.
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post #2 of 14
11/26/10 at 3:47pm
There is sata 2.0 (also called "3G" or "3Gb/s"), and sata 3.0 (also called "6G" or "6Gb/s"). As you might already have guessed, sata 2.0 has a maximum transfer rate of 3 Gigabits per second, and 6 Gigabits per second with sata 3.0.

Drives labeled as sata 3.0 mean that their controller is compliant with sata 3.0 specifications (power, instructions, available bandwidth). It doesn't mean that the drive magically reads and writes at 768MB/s.

My guess is some company started marketing their board as having "sata 6G" ports, and others followed suit for fear of loosing sales because sata 3.0 "sounds" slower/lesser by comparison.
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post #3 of 14
11/26/10 at 3:52pm
I only know that SATA III 6.0GB/s is 2 times faster than SATA II 3.0GB/s.
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post #4 of 14
11/26/10 at 3:59pm
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Quote:
Originally Posted by MrLinky View Post
There is sata 2.0 (also called "3G" or "3Gb/s"), and sata 3.0 (also called "6G" or "6Gb/s"). As you might already have guessed, sata 2.0 has a maximum transfer rate of 3 Gigabits per second, and 6 Gigabits per second with sata 3.0.

Drives labeled as sata 3.0 mean that their controller is compliant with sata 3.0 specifications (power, instructions, available bandwidth). It doesn't mean that the drive magically reads and writes at 768MB/s.

My guess is some company started marketing their board as having "sata 6G" ports, and others followed suit for fear of loosing sales because sata 3.0 "sounds" slower/lesser by comparison.
Thanks for the info.

It's sad they can't properly name things anymore. They seem to hype everything these days, even if it doesn't make any sense.

Quote:
Originally Posted by Little Overclocker/Gamer View Post
I only know that SATA III 6.0GB/s is 2 times faster than SATA II 3.0GB/s.
I guess that's how you have to look at it and ignore the rest!
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post #5 of 14
11/26/10 at 11:24pm
I thought mechanical drives have no difference between sata 2/3?
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post #6 of 14
11/27/10 at 3:19am
Quote:
Originally Posted by MrLinky View Post
There is sata 2.0 (also called "3G" or "3Gb/s"), and sata 3.0 (also called "6G" or "6Gb/s"). As you might already have guessed, sata 2.0 has a maximum transfer rate of 3 Gigabits per second, and 6 Gigabits per second with sata 3.0.
Actually there is no such thing as SATA 3 at all - the name is SATA 6Gb/s. The specifications for the standard specifically state that it should NOT be called SATA 3 (in the same way that there is no SATA 2 - that is SATA 3Gb/s. This is all to avoid confusion with the different speeds and resulting confusion over which version is being referred to). Sadly everyone seems to ignore this...

Quote:
Originally Posted by MrLinky View Post
Drives labeled as sata 3.0 mean that their controller is compliant with sata 3.0 specifications (power, instructions, available bandwidth). It doesn't mean that the drive magically reads and writes at 768MB/s.
This.

However a SATA 6Gb/s drive cannot write at 768MB/s - SATA 6Gb/s only offers 600MB/s of bandwidth for a drive, as the SATA protocols use 10bit encoding to detect/correct transmission errors. 6Gb/s = 6000Mb/s = 600MB/s for SATA. Similarly SATA 3Gb/s devices have a max speed of 300MB/s, and SATA 1.5Gb/s devices 150MB/s - hence the reason why they are often referred to as SATA300 and SATA150.

Quote:
Originally Posted by Little Overclocker/Gamer View Post
I only know that SATA III 6.0GB/s is 2 times faster than SATA II 3.0GB/s.
The interface offers twice the bandwidth, but that doesn't mean that anything is actually twice as fast in use.

Quote:
Originally Posted by kyle7412 View Post
I thought mechanical drives have no difference between sata 2/3?
This is true. In fact aside from a few features (like NCQ) with mechanical drives you won't notice the difference between SATA 1.5Gb/s, SATA 3Gb/s and SATA 6Gb/s at all.
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post #7 of 14
11/27/10 at 3:37am
I seem to remember reading somewhere that in SATA 6GB/s they'd "doubled" the bandwidth by allowing read/write commands to be sent simultaneously, rather than giving it a "true" double-bandwidth of previous SATA 3 GB/s?
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post #8 of 14
11/27/10 at 4:07am
Quote:
Originally Posted by Korlus View Post
I seem to remember reading somewhere that in SATA 6GB/s they'd "doubled" the bandwidth by allowing read/write commands to be sent simultaneously, rather than giving it a "true" double-bandwidth of previous SATA 3 GB/s?
All the SATA versions are half-duplex. SAS is full duplex however (as is USB3.0).

The new SATA version has increased bandwidth by icreasing the transmission frequency (and tweaking voltages etc). In essence it is a 'true' doubling in bandwidth.
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post #9 of 14
11/27/10 at 9:47am
I'm pretty interested in this one.
So, mechanical drives aren't able to go over the SATA300 bandwith potential? Not even in raid?
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post #10 of 14
11/27/10 at 10:41am
Quote:
Originally Posted by the_beast View Post
Actually there is no such thing as SATA 3 at all - the name is SATA 6Gb/s. The specifications for the standard specifically state that it should NOT be called SATA 3 (in the same way that there is no SATA 2 - that is SATA 3Gb/s. This is all to avoid confusion with the different speeds and resulting confusion over which version is being referred to). Sadly everyone seems to ignore this...
http://www.serialata.org/technology/6Gbdetails.asp
http://en.wikipedia.org/wiki/Serial_ATA
Although it's more popular to call it sata 6Gb/s, it still is technically called sata 3.0.

Also, if using the maximum speed rather than a revision number is a better moniker, why don't we call the various versions of the usb or hdmi by their throughput? Surely usb 1.5Mb/s, usb 12Mb/s, usb 480Mb/s, and usb 4.8Gb/s would be easier.
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