Ensuring my data will be wiped out safely

Discussion in 'OS X Yosemite (10.10)' started by zoran, Dec 27, 2014.

  1. zoran macrumors 68030

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    Jun 30, 2005
    #1
    An imac running Yosemite will be sold and want to wipe out everything personal, but without formatting the system drive or reinstalling the OS. As far as personal stuff, the following have been done on the iMac.
    1. There are a few applications installed
    2. An email account has been set in Mail
    3. A lot of browsing with Safari
    4. As for file use, there was an external USB3 hard drive connected, nothing written on the system drive, other than the apps installed!

    Apart from the listed "personal" stuff above, are there others that must be wiped out that i have not thought of?
     
  2. grahamperrin macrumors 601

    grahamperrin

    Joined:
    Jun 8, 2007
    #2
    Encrypt then erase the volume

    Not specific to Yosemite:
    1. Enable FileVault 2
    2. allow conversion to complete
    3. erase and install.

    OS X: How to erase and install – Apple Support

    There are various other methods. The method above will allow you to erase the volume very quickly when the time comes to sell.

    You really should erase the voume. It's simplest.

    (Without knowing a great amount of detail about what additional applications are installed, how they were installed, and so on, it's impossible to say exactly what you should selectively remove.)
     
  3. zoran thread starter macrumors 68030

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    #3
    I don't understand how can MacOSX be reinstalled after i quit disk utility (step8)! Where will the installation files be derived from? The internet?
     
  4. Bruno09 macrumors 68020

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    #4
    OS X will be downloaded from Apple servers, then installed.

    It's a ~5 GB download.
     
  5. zoran thread starter macrumors 68030

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    #5
    1. What happens if the user cannot connect to the internet?
    2. Can i choose to erase the drive, using the highest date wipe possible?
     
  6. Bruno09 macrumors 68020

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    #6
    1. no Internet = no download...

    2. why not but do you actually need this ?
     
  7. zoran thread starter macrumors 68030

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    #7
    1. So this way of reinstalling and wiping personal data is not very flexible
    2. Well one needs this security wipe it if he wished to pass this Mac to a new owner!
     
  8. BasicGreatGuy Contributor

    BasicGreatGuy

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    #8
    You can install the OS from a USB installer. Just make sure you shut down the computer once it tries to proceed with the user setup.

    Just inform the buyer that he or she will have to finish setting up the user part of the OS. Shouldn't be any problem with that.
     
  9. fisherking macrumors 601

    fisherking

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    #9
    what i've done:

    create a new admin user. log out of your account, and log in to the new one.
    then go to system preferences>users & groups, and completely delete the original account. (you may want to clean out applications as well, and change the name of the mac in the sys pref>shared window).
     
  10. zoran thread starter macrumors 68030

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    #10
    Thanks, this method though -i believe- will not delete personal data (and data in general) with high wipeout ability, am i correct?
     
  11. Mike MA macrumors 65816

    Mike MA

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    #11
    Just create a new admin user, delete the old one and than delete/overwrite the free memory by using the disc utility. Same effect as the Mac is still up and ready while your data incl. all logs and cache is completely whiped out!
     
  12. fisherking macrumors 601

    fisherking

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    #12
    it will wipe out EVERYTHING related to your account; the last thing to do is change your computer name in Shared preference in system preferences...

    see what mike MA says above.
     
  13. liya1201 macrumors member

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    Sep 8, 2010
    #13
    Last time, I wiped out my HD by using the "Shred" in Drive Genius 3 (3 Pass Random). I then scanned the erased HD by Data Rescue 3 without finding any meaningful files.
     
  14. BasicGreatGuy Contributor

    BasicGreatGuy

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    #14
    The simple way is to turn on FileVault. Once the drive is encrypted, go to Disk Utility and erase the disk.
     
  15. zoran thread starter macrumors 68030

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    #15
    Will there an Apple ID be required or any other thing or do i just need internet all it does everything by its self?
     
  16. KALLT, Jan 9, 2015
    Last edited: Jan 9, 2015

    KALLT macrumors 601

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    #16
    Can't you just format and reinstall OS X from the recovery partition (command + R before startup)? That way you ensure that all the personal data is indeed gone and the OS has undergone a clean install at the same time. The process is fairly straightforward. I wouldn't use any workarounds with FileVault or admin controls.

    You don't need an Apple ID. The only instance where this is suggested is at the account creation process, but even there it's optional. OS X does everything by itself, just follow the steps linked by grahamperrin and it will be finished in no-time.
     
  17. zoran thread starter macrumors 68030

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    #17
    If thats a way to do it, then i have no problem, someone in here advised me about downloading and needing internet connection!
    So let me check the steps once again:
    1. CMD+R at startup
    2. Disk utility and Erase
    and then what?
     
  18. KALLT macrumors 601

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    Sep 23, 2008
    #18
    http://support.apple.com/en-us/HT201376

    You quit Disk Utility and the main menu pops up again. There you choose "Reinstall Mac OS".
     
  19. zoran thread starter macrumors 68030

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    #19
  20. simonsi macrumors 601

    simonsi

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    #20
    Best you follow the link and actually look for yourself, checkout Step 1:

    "Before you begin, you need to be connected to the Internet."
     
  21. zoran thread starter macrumors 68030

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    #21
    Right now im connected to the internet using Ethernet, will this connection be working when i will be looking for a network in step 7 or i would only have to be using WiFi then?
     
  22. KALLT macrumors 601

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    #22
    Obviously ethernet will be enough.
     
  23. zoran thread starter macrumors 68030

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    #23
    Thank you all for the help!
    Lastly... one more thing, what if instead of Yosemite the imac was running SnowLeopard, what should i do then?
     
  24. AlanShutko macrumors 6502a

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    Jun 2, 2008
    #24
    If you want it to keep running Snow Leopard, you can reboot with the Snow Leopard install disc and format that way.
     
  25. DeltaMac macrumors 604

    DeltaMac

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    Delaware
    #25
    For Snow Leopard - you would boot to your Snow Leopard installer DVD, and erase/reinstall with that. (there is no internet install for Snow Leopard, as with newer OS X versions)
    If you don't have the DVD - the Snow Leopard installer is still available for sale from Apple.
    http://store.apple.com/us/product/MC573Z/A/mac-os-x-106-snow-leopard
     

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