1.    06 Sep 2016 #1
    Join Date : Feb 2016
    Posts : 8
    Windows 7

    Problems with USB SCSI Mass Storage Device

    Everytime my Seagate Expansion Portable Drive is plugged into my PC (Windows 10 64bit), Window's Event Viewer repeatedly reports warning messages:

    Event 129, UASPStor

    Reset to device,\Device\Raidport1, was issued

    Also, USB 3 write speed was extremely slow - it often took more then 8min to write a 5GB file into the drive. During the writing process, the writing speed cycled between 0MB/s to 90MB/s. Most of the time, the writing speed stayed at very low values, < 1MB/s.

    Device Manager reported that I have the latest UASPStor driver. If I disabled the UASPStor driver, the drive became disconnected.

    If I plugged in the Seagate drive into a Win 7 machine, it worked perfectly well.

    Can anyone help me to solve the problem?
      My System SpecsSystem Spec

  2.    07 Sep 2016 #2
    Join Date : Jun 2015
    Posts : 1,008
    Windows 10 Home x64 (Laptop), Windows 10 Pro x64 (Desktop)

    When that drive is connected, locate it in Device Manager and search for an updated driver.
      My System SpecsSystem Spec

  3.    07 Sep 2016 #3
    Join Date : Jul 2015
    Posts : 2,552
    10 Pro

    I had to give up on one of my external USB3 drives. It worked on Windows 7, and still works on OSX. From the research I did the reason is that up until Windows 7 Intel made the UAS drivers. In 10 they are made by MS and don't work quite the same.so some drives just don't work - it doesn't seem to be one specific manufacturer - see

    Can anyone use USB attached SCSI in 10? - Windows 10 Forums
    External Hard drive not accessible... - Windows 10 Forums

    I tried forcing the Windows 7 Intel drivers to install (you need to update the inf files as described here) but it still didn't work (although it did on Windows 8.1).

    The only solution I could find was to use a different enclosure. I guess a SATA --> USB 3 cable would also work.
      My System SpecsSystem Spec

  4.    07 Sep 2016 #4
    Join Date : Feb 2016
    Posts : 8
    Windows 7

    [QUOTE=Steve C;803255]When that drive is connected, locate it in Device Manager and search for an updated driver.[/QUOTE

    Thanks Steve. I tried your method, but problem persists.
      My System SpecsSystem Spec


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