Filevault and Selling Computer

Discussion in 'macOS Sierra (10.12)' started by machappyboy, Apr 2, 2017.

  1. machappyboy macrumors member

    Joined:
    Jun 29, 2010
    #1
    I'm selling my MacAir. Did not have Filevault turned on. Erased HD and reinstalled Sierra.

    Can I now turn Filevault on, reerase the HD, reinstall Sierra, then turn it off for the sale? I will definitively erase all data from when I was using the machin?
     
  2. fischersd macrumors 601

    fischersd

    Joined:
    Oct 23, 2014
    Location:
    Kitchener, Ontario, Canada
    #2
    That will likely take considerably more time than grabbing one of the utilities for doing random fills of hard drives to expunge your data securely, then formatting and reloading MacOS on the new volume.

    A bunch of them reviewed here (most you make bootable media to use them):
    https://www.lifewire.com/free-data-destruction-software-programs-2626174
     
  3. machappyboy thread starter macrumors member

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    Jun 29, 2010
  4. fischersd macrumors 601

    fischersd

    Joined:
    Oct 23, 2014
    Location:
    Kitchener, Ontario, Canada
    #4
  5. Weaselboy Moderator

    Weaselboy

    Staff Member

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    Location:
    California
    #5
    Yes. There is a small chance bits of old data would be on an area of the disk outside the FV volume, but the odds are low and that data would be very difficult for anybody to recover.
     
  6. hallux macrumors 68020

    hallux

    Joined:
    Apr 25, 2012
    #6
    If you turn on FileVault then erase the drive and re-install the OS there is no reason to go in and turn it back off.
     
  7. machappyboy thread starter macrumors member

    Joined:
    Jun 29, 2010
    #7
    I turned on filevault, erased the disk imagine, but when I used command+R to reboot, only the internet recovery mode was available. Why can't I install Sierra from the recovery partition?
     
  8. Weaselboy Moderator

    Weaselboy

    Staff Member

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    #8
    How did you erase the drive?

    It sounds like you erased the entire disk, including the recovery partition, leaving you only with Internet recovery.
     
  9. machappyboy thread starter macrumors member

    Joined:
    Jun 29, 2010
    #9
    I erased the 500 GB drive. I tried to erase the "sub disk" I forget what the name was.... but could click it. How should I have clicked it?
     
  10. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #10
    I'm still not clear how you were booted when you did this?

    What you should have done was command-r boot to the recovery partition, then run the command below in Terminal to blow off the FileVault image, then erase the OS volume, then install the OS.

    Code:
    diskutil cs delete "Macintosh HD"
    It sounds like perhaps you were in Internet recovery and erased the entire disk, which would wipe the recovery partition also.
     

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