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I don't get it. Why dont I have USB 2.0 ???


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10 replies to this topic

#1 TheEgg

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Posted 24 January 2010 - 09:05 PM

This is my motherboard. Under specifications, it clearly says USB 2.0

http://www.newegg.com/Product/Product.aspx...N82E16813130229

EDIT: I just installed the drivers from the cd and it now says enhanced USB in the device manager, but the speed appears to be the same (slow).

When I transfer big 400+ megabyte files from flash drive to pc, it takes a couple seconds. USB 2.0 speed is supposed to be 480 mb/s. So it should take only 1-2 seconds if I had 2.0, right?


:thumbsup:

Edited by TheEgg, 24 January 2010 - 09:21 PM.


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#2 Sneakycyber

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Posted 24 January 2010 - 09:08 PM

Did you install the drivers for the motherboard?
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#3 TheEgg

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Posted 24 January 2010 - 09:19 PM

I just thought of that after I posted this and did that. It now says enhanced in the device manager. I was hoping to edit this before anyone noticed.

But the speed is still slow. I have something that is 1gb. Shouldnt that take 3 seconds if it was 480 mb/s USB 2.0?

Edited by TheEgg, 24 January 2010 - 09:21 PM.


#4 ThunderZ

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Posted 24 January 2010 - 09:35 PM

The actual bottleneck may be the flash drive and not your USB ports. If they state "enhanced" then they would seem to be correct.

One thing concerning advertised transfer rates, they usual say "speeds up to".

Edited by ThunderZ, 24 January 2010 - 09:37 PM.


#5 Sneakycyber

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Posted 24 January 2010 - 09:39 PM

Even in a perfect world you would be hard pressed to reach the max bandwidth. You have to have everything off and the computer has to be at no load. Its just like a Cable modem even though they boast speeds of 15mbs your sharing your connection with several other people. If they are all online you will never achive 15mb/s. Your computer has allot to process while the port is capable of 480mbs your computer may not be..

""As far as we know, effective rate reaches at 40MBps or 320Mbps for bulk transfer on a USB 2.0 hard drive with no one else is sharing the bus. Flash Drives seem to be catching up too with the some hitting 30MB/s milestone. For all we know, USB interface could become become the bottleneck for flash drives as early as 2008.

Additional notes from Alex Esquenet - our engineer friend based in Belgium: "A fast usb host can achieve 40 MBytes/sec. The theorical 60 MB/sec cannot be achieved, because of the margin taken between the sof's (125 us), so if a packet cannot take place before the sof, the packet will be rescheduled after the next sof. On top of that, all the USB transactions are handled by software on the PC. For instance, a USB host on a PCI bus will send or receive the data via the PCI bus; the stack will prepare the next data in memory and receive interrupt from the host." "

Credit:EverythingUSB
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#6 TheEgg

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Posted 24 January 2010 - 09:47 PM

I was just thinking. When I copy and move something to another part of the computer on the same hard drive it never takes a second or two to move files anyway. Maybe the slowness is actually just the time it takes for the hard drive to read/write. I am using an IDE hdd btw.

#7 Sneakycyber

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Posted 24 January 2010 - 09:53 PM

That could be a problem too the ATA/133 UDMA 6 HDD is limited to 133/mbs Theres your bottleneck. Good find!
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#8 Platypus

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Posted 24 January 2010 - 11:39 PM

We need to be clear where we're using Megabyte/sec and Megabit/sec.

USB2 is 480 Megabit - hence in Sneakycyber's quote "A fast usb host can achieve 40 MBytes/sec. The theorical 60 MB/sec cannot be achieved"

So, The Egg, your 1GB USB transfer should take over 20 seconds.

ATA133 runs 133 Mbyte/sec, a touch over twice the theoretical for USB2.

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#9 TheEgg

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Posted 25 January 2010 - 09:11 AM

We need to be clear where we're using Megabyte/sec and Megabit/sec.

USB2 is 480 Megabit - hence in Sneakycyber's quote "A fast usb host can achieve 40 MBytes/sec. The theorical 60 MB/sec cannot be achieved"

So, The Egg, your 1GB USB transfer should take over 20 seconds.

ATA133 runs 133 Mbyte/sec, a touch over twice the theoretical for USB2.



WOW! Thats news to me. I always thought it was 480 MEGABYTES. I never noticed that. Thank you.


******Post of the thread award
*****^^^^^

Edited by TheEgg, 25 January 2010 - 09:11 AM.


#10 Sneakycyber

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Posted 25 January 2010 - 07:20 PM

OOPS :thumbsup: Sorry bout that. Nice catch Platypus
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#11 Platypus

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Posted 25 January 2010 - 10:07 PM

Watchin' out for ya, cyber! :thumbsup:

Edited by Platypus, 25 January 2010 - 10:08 PM.

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