Disk Utility

Discussion in 'Mac Pro' started by gw0gvq, Sep 11, 2015.

  1. gw0gvq Contributor


    Jan 30, 2012
    Barry, South Wales, UK
    I tried to format a memory stick in disk utility but its greyed out . Does anyone know why? I have tried with internet recovery yet its still the same. Any ideas would be great. Thanks
  2. haralds macrumors 6502a


    Jan 3, 2014
    Silicon Valley, CA
    Does it have a hardware protection tab? Did you encrypt a partition? If you did, you must unlock.
    Otherwise, it might have CoreStorage partitions on it, which often can be difficult to reparation

    I usually go to Lion or Windows for a wipe. Have not looked at any open source utilities.

    Coriolis iPartition can clean stuff up...
  3. dwig macrumors 6502

    Jan 4, 2015
    Key West FL
    I've been successful with reformatting a USB stick using the SDformatter from the SD Association. Both Mac Disk Utility and Windows 8.1's Disk Manager were unable to reformat the stick. The SDformatter was created to reformat SD, SD/HC, and SD/XC cards, but it found the stick and reformatted it so that is was usable on both OSX and Win.

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