20MB/s transfer via USB 2.0 to an external HDD slow?

Discussion in 'Linux Compatibility and Software' started by useroflaptops, Feb 21, 2010.

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  1. useroflaptops

    useroflaptops Notebook Evangelist

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    my transfer rate in linux is around 20MB/s for files using USB 2.0. this seems pretty slow. Is there a problem? What is your transfer speed?
     
  2. ronnieb

    ronnieb Representing the Canucks

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    Sounds pretty average to me
     
  3. Greg

    Greg Notebook Nobel Laureate

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    Well if you're copying files at 20MB/s that tells me you are definitely running at USB 2.0 speeds.

    Transfer speed depends on a few things. How fast your hard drive is, are you using a USB memory key or USB hard drive, how fast is that key or drive, are you transferring a bunch of little files or one big one?
     
  4. useroflaptops

    useroflaptops Notebook Evangelist

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    It is a USB SATA harddrive. I thought the max was like 50 something MB/s for USB 2.0, so Im kinda half the speed rite now.
     
  5. Greg

    Greg Notebook Nobel Laureate

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    USB can hit 60MB/s, but with protocol overhead you're looking at 40MB/s actual bandwidth tops (except under rare circumstances).

    Plus you have no idea how fast the USB controller is on that hard drive enclosure. It might top out at 20MB/s.
     
  6. useroflaptops

    useroflaptops Notebook Evangelist

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    Yea, true, it could be the HDD enclosure electronics, however the wierd thing also, is file transfer speeds actually drop off over long time of transfer. It usualyl starts off at 30MB/s (sometimes) and then over time it goes to 20MB/s.
     
  7. TANWare

    TANWare Just This Side of Senile, I think. Super Moderator

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    I Have a U81a and even on windows all I see is 20 MB/s. Now with my P7805-u I'll see 30 MB/s with the same drive.............
     
  8. downloads

    downloads Super Moderator Super Moderator

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    I have two different HDDs on different USB controllers and both average 22MB/s in HDTune read test, so I'm afraid it is normal.
    If you need better speeds it's either eSATA or USB 3.0
     
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