Erasing FileVault 2 volume prior to reinstalling OS

Discussion in 'Mac Basics and Help' started by matticus2016, Dec 15, 2016.

  1. matticus2016 macrumors newbie

    Dec 15, 2016
    I am preparing my mid 2012 MacBook Air for sale.

    It is encrypted with FileVault 2. What I need clarification on, is when I boot the system and access Disk Utility, it requires me to 'unlock' the volume before I can erase it. Does entering my password to unlock the volume decrypt it?

    What I want to accomplish is deleting the volume while it's encrypted and then reinstall the OS for resale.

    Thanks all!
  2. chabig macrumors 601

    Sep 6, 2002
    Unlocking the volume doesn't remove the encryption, which you will need to do in order to sell the machine. Nobody will buy your computer if it's encrypted. Unlock, erase, decrypt, then reinstall the OS.
  3. Weaselboy Moderator


    Staff Member

    Jan 23, 2005

    Do the things in this link first.

    Then do this... command-option-r to boot to Internet recovery (not command-r to recovery). Select your wifi then you will see a globe while the recovery utility downloads. Once the recovery screen comes up, go to the Utilities menu up top and select Terminal. Now enter the command below to erase the FileVault core storage volume. If your volume is named something other than the default Macintosh HD, modify the command to your volume name.

    diskutil cs delete "Macintosh HD"
    Now quit Terminal and launch Disk Utility and go to the erase tab. Select the drive itself at the very top of the left column. Then in the dropdown select Mac OS Extended (Journaled) and apply that format. Now quit Disk Utility then click reinstall OS up top. Then wait for the ~8GB OS to download and install. At the end it will restart and launch into a system setup screen. When that happens just hold down the power button to shut it off. All ready to sell.

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