USB 3 external drive performance?

Discussion in 'OS X El Capitan (10.11)' started by Sanlitun, Jun 28, 2015.

  1. Sanlitun macrumors 6502

    Sanlitun

    Joined:
    Sep 19, 2014
    Location:
    127.0.0.1
    #1
    Anyone else experiencing very slow performance from external USB 3 storage? I know the release notes specify issues with USB 2 but say nothing about this.

    I have a SSD in an external USB 3 enclosure that I get 400 MB/s on my Macbook Pro but now on my nMP
    I am lucky to get 40 MB/s.

    Anyone else seeing this?
     
  2. Mr. Retrofire macrumors 601

    Mr. Retrofire

    Joined:
    Mar 2, 2010
    Location:
    www.emiliana.cl/en
    #2
    @Sanlitun: AFAIK, they update the USB drivers. Do not use 10.11 Developer Previews with your important USB devices!
     
  3. leventozler macrumors 6502

    Joined:
    Feb 18, 2009
    #3
    I get ~140MB write 360MB read (couple years old SSD)

    Checked another external SSD drive connected to a Trust USB 3.0 Hub and got ~36MB read/write. Check System Information > USB and make sure it's listed as USB 3.0 device.
     
  4. SG- macrumors regular

    SG-

    Joined:
    Jun 8, 2015
    #4
    the release notes mention there's USB issues for last two builds.
     
  5. yjchua95 macrumors 604

    Joined:
    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #5
    Transcend JetDrive enclosure here with an Apple SD256E SSD here (pulled from an Ivy Bridge retina MBP) - 330MB/s writes and 400MB/s reads.
     
  6. SoyCapitanSoyCapitan macrumors 68040

    SoyCapitanSoyCapitan

    Joined:
    Jul 4, 2015
    #6
    Looks like the USB driver isn't ready yet. Is there any hint it supports the latest XHCI 1.1 standard for USB 3.1 speed?
     
  7. MikhailT macrumors 601

    Joined:
    Nov 12, 2007
    #7
    No problems here with USB3 dual-bay chassis (Oyen Digital RAID v2), 350MB+ on both read/write.
     

Share This Page