- Feb 26, 2014
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Hi everyone,
I have a question on the actual transfer speed of USB3.0. As far as I know, USB3.0 claims to support 5Gb/s, equivalently 650MB/s.
However, reality turns out to be against all it's claims - well, at least when working with desktop raid systems.
Let's first take a look at some products by La'Cie.
http://www.lacie.com/asia/products/product.htm?id=10607
http://www.lacie.com/asia/products/product.htm?id=10601
La'Cie 4big and 5big series. 4big is powered by USB3.0, while 5big is powered by thunderbolt (In theory, thunderbolt can goes up to 10gbps. And yes, this is just the 1st generation).
5big has only 1 bay more than 4big. However if you compare the transfer speed, 5big is significantly higher than 4big (785MB/s to 245MB/s). Wouldn't USB3.0 be the culprit of the speed degrade?
Now let's take a look at the G-tech.
http://www.g-technology.com/products/g-speed-q
http://www.g-technology.com/products/g-speed-es-pro
G-speed Q and G-speed es PRO use exactly the same hard drives, and has exactly the same bays. The only difference is that G-speed Q uses USB3, while G-speed es PRO uses miniSAS (miniSAS can goes up to 12Gbps). Again, transfer speed through miniSAS crushed USB3.0 (640MB/s to 252MB/s).
If you are about to say, well, these are just numbers on a piece of paper. Have you really tested the real speed on your computer?
Well, first thing is, these companies are hard-core companies. And I have confidence that these figures are achieved through real experiments. Secondly, I found this link from youtube,
http://www.youtube.com/watch?v=LRT8cGkmNsk
which also suggests that USB3 will lead to a slow transfer speed.
I can't think of any reason which causes the problem. Your IDEAS or GUESSES are welcome.
Thank you.
I have a question on the actual transfer speed of USB3.0. As far as I know, USB3.0 claims to support 5Gb/s, equivalently 650MB/s.
However, reality turns out to be against all it's claims - well, at least when working with desktop raid systems.
Let's first take a look at some products by La'Cie.
http://www.lacie.com/asia/products/product.htm?id=10607
http://www.lacie.com/asia/products/product.htm?id=10601
La'Cie 4big and 5big series. 4big is powered by USB3.0, while 5big is powered by thunderbolt (In theory, thunderbolt can goes up to 10gbps. And yes, this is just the 1st generation).
5big has only 1 bay more than 4big. However if you compare the transfer speed, 5big is significantly higher than 4big (785MB/s to 245MB/s). Wouldn't USB3.0 be the culprit of the speed degrade?
Now let's take a look at the G-tech.
http://www.g-technology.com/products/g-speed-q
http://www.g-technology.com/products/g-speed-es-pro
G-speed Q and G-speed es PRO use exactly the same hard drives, and has exactly the same bays. The only difference is that G-speed Q uses USB3, while G-speed es PRO uses miniSAS (miniSAS can goes up to 12Gbps). Again, transfer speed through miniSAS crushed USB3.0 (640MB/s to 252MB/s).
If you are about to say, well, these are just numbers on a piece of paper. Have you really tested the real speed on your computer?
Well, first thing is, these companies are hard-core companies. And I have confidence that these figures are achieved through real experiments. Secondly, I found this link from youtube,
http://www.youtube.com/watch?v=LRT8cGkmNsk
which also suggests that USB3 will lead to a slow transfer speed.
I can't think of any reason which causes the problem. Your IDEAS or GUESSES are welcome.
Thank you.
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