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why can't I get high speed data transfer with USB 3.0?


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#1 kwayjay

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Posted 25 February 2011 - 02:28 PM

Hi I have just got hold of the following: Dane - Elec So Super Speed USB 3.0 express card and an Iomega eGo portable hard drive USB 3.0 compatible. These are connected to a HP Pavillion dv6 Notebook running Vista.
when I transfer data using this set up I get transfer speed of 24 Mbps which does not seem very fast, especially when according to the dane-elec quick guide, it supports up to 5 Gbps. When I use my normal USB 2.0 set up I get transfer speeds of up to 16 Mbps.
Are there some settings I should be adjusting somewhere, or is that all I can expect from my new setup?
thanx for your time
Margott
here is a link for some fotos that me be helpful http://img690.imageshack.us/g/daneelecpcie.jpg/

Edited by hamluis, 25 February 2011 - 06:41 PM.
Moved from Vista to External Hardware.


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#2 hamluis

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Posted 25 February 2011 - 06:40 PM

The key, IMO, is knowing the value...or lack thereof...of specs :).

<<...it supports up to 5 Gbps...>>

That means...under lab conditions and with all things favorable...for a second...

The max theoretical speed at which anything might perform...is always something to be scoffed at, IMO. If you are buying a computer component and you are concerned with how fast it can operate...first thing you have to realize is that other parts of the system might limit optimal performance.

"The maximum speed of USB 3.0 is 4.8Gbps.
Itís true: USB 3.0 SuperSpeed will be 10 times faster than the 480Mbps limit of the 2.0 spec. The example Intel likes to give out when talking about the new speed is that transferring a 27GB HD movie to your future media player will only take 70 seconds with USB 3.0, while it would take 15 minutes or more with 2.0. Keep in mind that youíre only going to be able to take advantage of this speed if your portable storage device can write data that quickly. Solid state devices will benefit most from the speed boost, while magnetic hard disks will be limited by their RPM and corresponding read/write speeds. Also, new Mass Storage Device drivers will have to be developed for Windows to take advantage of the spec."

Article at http://www.maximumpc.com/article/features/everything_you_need_know_about_usb_30_plus_first_spliced_cable_photos , you may want to also reference http://www.everythingusb.com/superspeed-usb.html .

http://www.brighthub.com/computing/hardware/articles/24772.aspx

Since this is really a hardware question (IMO), I'll move this.

Louis

#3 ThunderZ

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Posted 25 February 2011 - 09:07 PM

One other thing besides the information provided by Louis.

Looking at the SPECS PAGE for your Notebook states 4 USB ports. It does not state 3.0 USB.

While your peripherals are 3.0, they are also backwards compatible to 2.0 Possibly why you are getting slower speeds then expected.

#4 kwayjay

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Posted 26 February 2011 - 01:17 PM

Hi Guys thanx for getting back to me on this.
Hamlius I did not expect up to 5Gbps, but I did expect something a bit more that what I was getting. Not really based on any research I had done but just by reading the manuals and the packaging. It was a bit surprising how slow it worked out to be.
ThunderZ Little unsure about what your point is. I know that my laptop doesn't support USB 3.0 itself: that's why I got the Dane - Elec So Super Speed USB 3.0 express card, so that it would.
Really its just all a bit annoying. I thought I would just try the USB 3.0 out. I knew I could not take advantage of any of the benefits without a USB 3.0 compatible computer, but then i saw the PCIe USB 3.0 interface and I thought I would try it out. Well at least I know now and I wont be bothering again for quite a while. That's what happens if your an earlier adopter.....Good job I didn't bother with a 3D TV.
Thanks again
Kwayjay and Margott
Mind you looking at this it looks as if I'm getting about what I should be getting http://www.everythingusb.com/iomega-ego-usb-3.0-portable-hard-drive-20494.html

Edited by kwayjay, 26 February 2011 - 01:25 PM.


#5 Platypus

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Posted 26 February 2011 - 05:03 PM

Mind you looking at this it looks as if I'm getting about what I should be getting http://www.everythingusb.com/iomega-ego-usb-3.0-portable-hard-drive-20494.html

Yes, it's the performance of the drive itself that governs your outcome, see a similar discussion here:

http://www.bleepingcomputer.com/forums/topic376816.html

Your 50% increase between USB2 and USB3 is quite good. You won't notice the full potential of USB3 until you use a device that would have been held back by USB2.

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