Wiping Hard-Drive..

Discussion in 'iMac' started by EarlofCroydon, Feb 6, 2011.

  1. EarlofCroydon macrumors member

    EarlofCroydon

    Joined:
    Jun 4, 2010
    #1
    Sold my iMac through eBay and need to wipe the hard drive.
    Bit worried it will cause issues and also does a hard drive wipe
    delete applications? As I would like to leave some on there...
    also. How to do it?

    Thanks
     
  2. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #2
    Delete everything you want of this iMac, including your user (from another admin account), then go to Disk utility and select ERASE FREE SPACE.
     
  3. biggd macrumors 6502

    biggd

    Joined:
    Apr 6, 2008
    Location:
    Calgary
    #3
    Putting the disk in, reformating and reinstalling is the best bet.
    You clear all your data, you free up HDD space, and you'll speed up the iMac. If you wish you could re-install apps for your buyer after.
     
  4. chris98vf macrumors regular

    chris98vf

    Joined:
    Mar 3, 2010
    #4
    ok, here's the deal, ignore everything above and do exactly this...
    Insert your install DVD and go to the Disk Utility when the install screen comes up. It's on one of the drop down menus up top.
    Now that you have Disk util open select your hdd and click the format tab.
    Format it using the security settings for a 7 pass format. Doing so will wipe your drive block by block not only once but 6 more times after. This is the same standard the DOD uses.
    Not doing so will basically leave all of your data intact for anyone with slight curiosity to see every picture, video, email, document, ect... and all they need is an app they can download in 3 minutes.
    I cannot stress this enough, format the drive properly and you'll be safe. If you want the added protection of ridiculous redundancy run the 35 pass format. Just so you know on average it takes 45 minutes per pass depending on the size of your drive so a 7 pass will take roughly just under 6 hours.

    KEEP THOSE PICS OF THE WIFE TO YOURSELF ;)
     
  5. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #5
    So the posts of biggd and me are not valid?

    Btw, ZEROING OUT is enough, as even that can't be restored with software one can find in 33 minutes.
    DiskWiping – One Pass is Enough

    Assuming the average WRITE speed during this 7-pass erase is 52MB/s (just tested it), then the 7-pass erase can erase 137GB in 45 minutes.
     
  6. chris98vf macrumors regular

    chris98vf

    Joined:
    Mar 3, 2010
    #6
    If you have the right software, which isn't hard to find, you can recover data. How do you think pedo's get caught?
    I have formatted many 160GB hdd's and one pass using the utility takes about 45 minutes.
    Take this advice from someone who has actually recovered and destroyed data, USE MULTI PASSES!
     
  7. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #7
    So does that mean, writing zeroes onto a HDD once does not delete anything?
    There seems to be conflicting positions about this:



    from Best way to securely erase my entire MBP HDD?
     
  8. Meyvn macrumors 6502

    Joined:
    Feb 3, 2005
    #8
    Are you really worried "some guy that bought your computer on eBay" is after your old porn collection? If not, basically do what simsaladim says.

    Though first, you'll want to go into Accounts under System Prefs & create a new Administrator-level account so you can delete that other one from it.

    Complete erases like the other folks are talking about will wipe the apps you're trying to give the new person, so you'd have to reinstall all that pirated software you promised 'em. :p
     
  9. chris98vf macrumors regular

    chris98vf

    Joined:
    Mar 3, 2010
    #9
    very good info, btw... I used the 35 pass when selling my personal iMac. Nothing illegal but there's no way I want anything of mine out there just in case. Just for piece of mind I would still go with at least the 7 pass and if you're so inclined get the Ultimate Boot CD and go nutz.
     
  10. skiltrip macrumors 68030

    Joined:
    May 6, 2010
    Location:
    New York
    #10
    The way I see it, there's no harm in the 7-pass "just to be safe". Start it before you go to bed. It'll be done waiting for you in the morning. No need to make a big hoo-ha about the whole thing, or god forbid, sit and watch it while it's doing the 7 Pass Shuffle.
     
  11. 300D macrumors 65816

    300D

    Joined:
    May 2, 2009
    Location:
    Tulsa
    #11
    A 7 pass is a complete waste of time. A single pass will destroy data beyond the point even professional forensics companies can recover.
     

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