USB formatted as MS-DOS won't open in Windows

Discussion in 'OS X El Capitan (10.11)' started by Randall88, Sep 23, 2016.

  1. Randall88 macrumors newbie

    Joined:
    May 22, 2015
    #1
    A USB drive that was working within Windows 10 I couldn't open in Mac.
    So I erased / formatted it to MS DOS Fat... which should be compatible with both OS.

    However, when I now put it back in Windows, this is what shows up..

    Why is this happening, and what can I do ?

    It's quite urgent... thanks!
     

    Attached Files:

  2. rctlr macrumors 6502a

    rctlr

    Joined:
    May 9, 2012
    #2
    Did you format it with a MBR (Master Boot Record)?
    I've found, it's better to do that if you want to swap the USB Drive from OS to OS.
     
  3. keysofanxiety macrumors 604

    keysofanxiety

    Joined:
    Nov 23, 2011
    #3
    Ensure your drive is plugged in.

    1) Open an elevated command prompt. You can do this by right-clicking the Start button at the bottom-left and select 'Command Prompt (Admin)', or whatever is synonymous with that.

    2) Type in diskpart and press Enter.

    3) This will bring up the DISKPART> command prompt.

    4) Type in list disk and press OK.

    5) You will now get a list of disks, numbered.

    6) Figure out which one is your USB drive. For instance, Disk 1. Then type in select disk 1 and press Enter (assuming disk 1 is your drive).

    7) Type in clean and press Enter.

    8) Type in create part primary and press Enter.

    9) Type in assign and press Enter.

    10) You should then get a new dialogue message in Windows saying the disk needs to be formatted. Reformat as FAT32 or exFAT.

    Please let me know if this works. :)
     
  4. McCloud94 macrumors newbie

    Joined:
    Sep 9, 2016
    #4
    awesome guys, thank you!

    this did the trick. For some reason, I thought I'd choose MBR only when I want a bootable USB.
     

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