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  1. #1
    New Lounger
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    USB3 speed theory vs.practice

    Data transfer speeds via USB port are very different. It certainly related on system settings (win7_64bit) as well as file type, USB2/3, etc.
    My question is related to USB3 transfer, which should be the fastest, but sometimes it's frustratingly slow. I tried several new USB3 external hdds (WDpassport edge 500GB, Adata HV620_500), various flash memory. At the beginning of the big file transfer (1GB), it sets off in cca90MB/sec, then it slows down to 4KB/s. It's somehow improve? Update drivers, or something? I use both Windows Explorer or Total Commander, it's the same.
    Thanks for your advice or tip for acceleration.
    Peter

  2. #2
    Super Moderator CLiNT's Avatar
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    Yeah, I've yet to reach anywhere near USB 3.0 "advertised" speeds. That is even with mechanical & or SSD drive on
    a brand spanking new X99 chipset. It still seems slow to me, although I havn't actually clocked it, I'm certain it's more than 90, but varies sporadically throughout the transfer.

    *You could try a USB chipset update if your board is up for one. Chipset updates should always be performed
    when a new one comes out. If you've got an older board, say early USB 3.0 adaptation, you'll likely not see one.
    *Perform a fresh boot before attempting to transfer large files, just to clear out the memory.
    *Take note of other processes on the system that may be using memory the same time your about to make
    a file transfer with USB 3.0 and close them.
    *getting into the practice of keeping a clean and lean system will usually boad well for USB transfer speeds too.
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  3. #3
    5 Star Lounger
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    It ain't pretty. It never is. I remember a discussion about this including input from the USB Stds. Committee (whatever they are called). If I find it I will post the link. Based on prior speed claims for various I/O ports you get what you actually get and over a couple of years you get twice the original speed via various tweaks from various sources. But if it is 10% of what the spec authors claim at the beginning it is doing well.

  4. #4
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    I've seen the same thing. In general:

    - Some USB 3 devices fail to be recognized by USB 3 ports. The USB device cannot be used until the computer attaches it correctly;
    - I've had very good luck with those same USB 3 devices in USB 2 ports. The device then works fine though at slower speed of course. Windows then taunts you with messages that "this device could work faster" messages,
    - A few very large files transfer much, much faster than thousands of very small files. The difference is dramatic, on the order of 10X - 100X speed difference.

  5. #5
    5 Star Lounger
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    Here is the link I remembered that I thought might apply to this discussion:
    http://www.tomshardware.com/reviews/...urbo,3215.html

    It does not since it is really for attached (external) mass storage drives.

    Here are a few more that I explored for explanation (found in history):
    http://event.asus.com/mb/2010/The_Be...For_USB3.0.htm

    https://en.wikipedia.org/wiki/USB_3....ynchronization

    http://vr-zone.com/articles/usb-3-0-...dup/13358.html

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