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USB speed

Discussion in 'Hardware' started by rockballad, Jul 13, 2007.

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  1. rockballad

    rockballad Thread Starter

    Joined:
    May 4, 2007
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    Hi,

    I have a USB 2.0, in theory, the max speed of it is 480Mbps. I also know that this speed has to be shared to other devices (USB mouse, ...) so the real speed is much lower. My USB reached 7000-9000 Mbps before. But once I formated it (to make bootable device), the speed slowed down, only 1000-2000 Mbps. Is there any software or approach to recover the original speed to the USB?

    Thanks in advance for your help!

    Regards,
     
  2. JohnWill

    JohnWill Retired Moderator

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    The real speed of USB will depend on the controller on the other end. What are you connecting to?

    I've benchmarked a number of USB hard disks on my systems here, and the average around 20mbytes/sec throughput, that's as good as it gets. Even though the raw speed of IEEE-1394 is slower than USB 2.0, Firewire disks typically hit close to 30mbyte/sec, due to the greater use of hardware assist in the Firewire controllers.

    You need to be a lot more specific as to what you're measuring and how.
     
  3. rockballad

    rockballad Thread Starter

    Joined:
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    Hello JohnWill,

    I'm not very sure about "the controller on the other end", but it's just a USB Mass Storage Device - Generic USB Flash Disk, or a thumb disk, 1GB.

    Would you tell me what tool I have to use to benchmark the USB speed first?

    Thanks,
     
  4. JohnWill

    JohnWill Retired Moderator

    Joined:
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    A USB FLASH disk is limited by the speed of the FLASH memory chips, and rarely comes close to saturating the bandwidth of the USB channel. Some can be as slow as 1 mbyte/sec, and I've seen them in the 15 mbyte/sec range. Also, write speeds are usually slower than read speeds on USB FLASH disks.

    How did you format it to make it bootable? That seems to be the issue here.
     
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