Wiping hd so its secure...

Discussion in 'MacBook' started by heliocentric, Jan 9, 2011.

  1. heliocentric Guest

    Joined:
    Nov 26, 2008
    #1
    hi, im selling on the old 500gb hard drive in my macbook in order to get a 1tb. Whats the safest way to wipe it so the information on it is no retrievable?

    I assume zeroing out the data with disk utility? would one pass , 7 pass or 35 be best?

    Thanks
     
  2. Hellhammer Moderator

    Hellhammer

    Staff Member

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    Dec 10, 2008
    Location:
    Finland
    #2
    35-pass is the best but it takes ages to complete. In most cases, 0-pass is more than fine but if you got time, you could use 7-pass, it's a good option in the middle.
     
  3. heliocentric thread starter Guest

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    Nov 26, 2008
    #3
    i was gonna go with 7 pass...is 35 really worth it?
     
  4. Hellhammer Moderator

    Hellhammer

    Staff Member

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    #4
    IMO not unless you have something super secret in there. In theory, 0-pass already overwrites everything
     
  5. heliocentric thread starter Guest

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    Nov 26, 2008
    #5
    nothing state secret like haha

    just banking information, phone numbers, address...that kinda thing
     
  6. Mutinygraphiks macrumors regular

    Mutinygraphiks

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    Jan 5, 2011
    Location:
    Las Vegas, NV
    #6
    7 or 35 passes will wipe it un-retrievable.
     
  7. heliocentric thread starter Guest

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    Nov 26, 2008
    #7
    Really?

    I read once that data was retrievable no matter what you did...
     
  8. Hellhammer Moderator

    Hellhammer

    Staff Member

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    #8
    0-pass writes zeros to the disk once. 7-pass does it 7 times and 35-pass does it 35 times. That means all your data (which is just numbers and alphabets in the HD) will be overwritten with 0 which causes the old data to be unrecoverable.
     
  9. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #9
    That's not true. Don't believe everything you read. Even after 1 pass, the data is irretrievable. 7 passes is overkill. 35 is useless overkill.
     
  10. Mutinygraphiks macrumors regular

    Mutinygraphiks

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    #10
    someone who buys it won't be able to recover anything from your disk, once wiped nothing will be on it.
     
  11. heliocentric thread starter Guest

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    Nov 26, 2008
    #11
    Ok, i shall do a 7 pass !

    Thanks for putting my mind at ease :)
     
  12. Quad5Ny macrumors 6502a

    Quad5Ny

    Joined:
    Sep 13, 2009
    Location:
    New York, USA
    #12
    Don't waste your time on a 7-pass wipe, just do a zero pass.

    Ask any data recovery company if they can recover data on a 'Zeroed' drive, the answer for 99% of them will be no.

    Even if you were a pedo or some crap and the policed grabbed your drive they wouldn't be able to recover anything using standard techniques (normally they just do a 1-1 clone of your drive, because if they tampered with it, it wouldn't be viable evidence anymore).

    Maybe, if you were a spy they would take the time to put the platters on a spin stand and recover the data.


    (You could also download secure erase which uses your hard drives internal wiping routine to erase the drive. Its much quicker than going through the SATA bus.)
     

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