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  1.    27 Sep 2015 #11
    Join Date : Feb 2015
    Bamberg Germany
    Posts : 18,000
    Win10 Pro, Win10 Pro N, Win10 Home, Win10 Pro Insider Fast Ring, Windows 8.1 Pro, Ubuntu

    Using Windows own tools., I'm out of options then. You might have to use the 3rd party tool that Mark already mentioned, or if you have a Linux distro live disk laying around, use Gparted(or down load it here). Get the ISO and either burn it to a USB or DVD and then boot into it. I usually use this. Here's a couple of screenshots of it from my VM, note what the dropdown menus offer:
    Click image for larger version. 

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      My ComputersSystem Spec
  2.    27 Sep 2015 #12
    Join Date : Jul 2015
    Posts : 3,788
    10 Pro

    What drive are you trying to use? I have a USB 3 iomega eGo that with Windows 10 completely fails to work. Windows 10 will read from it but not write anything larger than a few KB and can't format it. If I try any big writes explorer hangs and I have to shut down.

    In my case it is the Microsoft UAS driver (version 10240) that is the problem. The Intel one in Windows 7 still works as does Linux and OSX on the same hardware.

    Windows 10 will happily use it through USB 2 but not USB 3 UAS. According to iomega website my drive isn't compatible with windows 8 so this might be your problem also.
      My ComputerSystem Spec

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