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  1. #1


    Member Since
    Jul 23, 2013
    Posts
    3
    Disk partitions deleted & Device is write locked
    Mac profesionals,

    I'm having the following problem;

    My cousin would install windows on my macbook air, he putted the usb inside and booted from the usb into windows. deleted all my partitions and couldnt install windows because the GMX partions. Now I want install a new version of osx and after with bootcamp istall windows too. BUT... The device is locked, I can't use the disk utility, I can't restore, I can't reinstall osx. I tried to boot with ''CMD+S'' but the difference I see to my macbook and most internet helping guides is the command line start with ''boot #'' and at my mac ''-sh-3.2#''

    If I write the command line ''/sbin/mount -uw /''

    I get: 'Device is write locked''
    '0 [level 3] [Readuid 0] [Facility com.apple.fs] [Errtype I0] [ErrNo 13] [I0Type Write] [PBlk288552] [LBlk18661]

    Please help, I want to use my macbook again and kill my cousin

  2. #2


    Member Since
    Jul 23, 2013
    Posts
    3
    Update:
    When start with ''CMD+s'' It's appear too:
    ''Root device is mounted read-only''
    Singleuser boot -- fsck not done

    If someone need more info, please tell..

  3. #3

    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Location
    Texas, where else?
    Posts
    26,519
    Specs:
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S
    what Mac?
    What version of OS X?

    if 10.7 or 10.8, tried booting with command + R ?
    if 10.6 or earlier, tried booting from the disc that shipped with your computer?
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

  4. #4


    Member Since
    Jul 23, 2013
    Posts
    3
    Quote Originally Posted by bobtomay View Post
    what Mac?
    What version of OS X?

    if 10.7 or 10.8, tried booting with command + R ?
    if 10.6 or earlier, tried booting from the disc that shipped with your computer?
    I'm realy new into mac and just learned littlebit the way around till this happens..
    The dvd I got with it, is lost and I allready try to download a new one and put it on usb, but when it reads the usb, a cross apears after 1min.
    What version of OSX, I really don't know but the type macbook is an Air A1466 EMC 2559 if this helps.. thnx allready

  5. #5

    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Location
    Texas, where else?
    Posts
    26,519
    Specs:
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S
    It would have shipped with 10.7 or 10.8.
    It would not have had a disc shipped with it.

    Tried booting with cmd + R yet?
    Then open Disk Utility after it boots up and repartition the drive.
    You'll need to be connected to the internet and it should do an internet recovery install.
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

  6. #6

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    22,402
    Specs:
    Imac 27", 3.3GHz, 512 flash storage, 16GB memory, macOS Sierra.
    From the model number it came with Lion OS X.7 so there were no DVD's. Do as bobtomay suggests and use Lion recovery and proceed from there. Want a good tip? Keep others out of your MBA.

    Fingers crossed and keep us posted?

    http://support.apple.com/kb/HT4718
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

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