Discussion in 'MacBook Air' started by MacBook Air1111, Aug 7, 2017.

  1. MacBook Air1111 macrumors newbie

    MacBook Air1111

    Aug 7, 2017
    I tried to factory’s reset by erasing all data in “Macintosh HD” then I tried to reinstall Mac OS but OS X Base System is a locked disk. And the only disks in my disk utility are APPLE SSD a few numbers and letters then Media and OS X base system! I don’t know what to do
  2. Audit13 macrumors 68040


    Apr 19, 2017
    Toronto, Ontario, Canada
    Did you try doing a internet restore? Do you have a USB key with the macOS installer?
  3. posguy99 macrumors 6502a

    Nov 3, 2004
    It should be a locked disk. You don't want to install over the installer image, you want to install on the SSD.

    If you didn't know what you were doing, you shouldn't have started.
  4. dangerfish macrumors 6502

    Aug 28, 2007
  5. madrich macrumors 6502


    Feb 19, 2012
    World Class City of Chicago
  6. kohlson macrumors 68000

    Apr 23, 2010
  7. filmbuff macrumors 6502a


    Jan 5, 2011
    I had this problem recently and had to try several times to wipe and reformat the disk using disk utility, and finally was able to use internet recovery to download and install a new copy of Mountain Lion (the original OS) and then upgrade back to Sierra. What a pain. Plan C was to boot from a Ubuntu flash drive and use the Ubuntu disk utility to unmount and erase Macintosh SSD. The whole problem happened because I tried to restore my computer without disabling Filevault first. It should have worked fine since I had the disk password but something went awry.
  8. meeebee macrumors member


    Jan 23, 2016
    Try the Cmd+R first. If that doesn't work then create a USB installer if you can get access to another Mac (link is for El Capitan - do a search if you are looking for another version).

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