7 pass erase

Discussion in 'iMac' started by DeChrii, Apr 21, 2011.

  1. DeChrii macrumors member

    Mar 9, 2011
    Heyy all! So recently I gave my iMac 27" 2009 to my dad and decided to restore the iMac back to day 1 . I read around online for directions and most said to use the erase option in disk utilities. They also said to use the 7 pass erase. The iMac only had about 200gB of storage and it has been erasing for almost 4 days now and only at half way done. From what I've read, it should only take a few hours so do you think I should cancel the erase and finish it with a 1 pass erase or just let it finish? It still says 6 days remaining which is an awful long time. Thanks
  2. simsaladimbamba

    Nov 28, 2010
    The 7-pass erase is for the complete 1TB, not just for the 200GB you used out of it. You can safely cancel and reformat the HDD again via Disk Utility without erasing it securely now.

    But a one pass of securely erasing 1TB should only take six hours at 50MB/s.
  3. Vizin, Apr 21, 2011
    Last edited: Feb 28, 2013
  4. Diesel-Benz macrumors member

    Apr 17, 2011
    One pass will render ALL the data physically impossible to recover by any machine, software or forensics service. More than one pass is a complete waste of time.
  5. Criticalmass macrumors member


    Apr 12, 2011
    Actually, 1 pass is only good enough for people who wouldn't know what to do with whatever they recovered in the first place.

    7 pass is good enough for the people who WOULD know what to do with whatever they recovered.

    If you haven't noticed. Cybercrime and data recovery by criminal organizations is big business these days. I guess that's why they call them Organized Crime Syndicates and why they siphon off hundreds of millions of dollars from individuals and corporations in the last couple of years..
  6. thermodynamic Suspended


    May 3, 2009
    Let it finish the 7-pass method if possible. Or let it go overnight.

    If you feel comfy aborting it the next morning, that's probably okay, but the more passes mean a more efficient job. As has been said, most people aren't going to care, but somebody might.

    The iMac could be running warm as well; do you have an extra fan you can blow on the back of it?
  7. Badger^2 macrumors 68000


    Oct 29, 2009
    If I was giving my old iMac to my DAD I would just do a simple 1 minute erase.

    Are you afraid he might turn into a uber hacker overnight? =)

    and if he did -- whats on that old iMac that he couldnt see?

    I think you are making it overly complicated.
  8. kfscoll macrumors 65816


    Nov 3, 2009
    No doubt. 7-pass is overkill if you're just giving it to your Dad.
  9. Vizin, Apr 23, 2011
    Last edited: Feb 28, 2013
  10. Diesel-Benz macrumors member

    Apr 17, 2011
    Incorrect. 1 pass leaves nothing to be recovered.

    If the data is so important that you MUST have 7 passes to be secure, you wouldn't be letting anyone else see the drive in the first place, it would be destroyed instead.

    Which persons ass did you pull that "information" out of?

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