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  1. #1
    35 pass erase free disk space disk utility

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    Question 35 pass erase free disk space disk utility
    can the previous information EVER be recovered? Even with the highest technology ever invented?

  2. #2
    35 pass erase free disk space disk utility
    chscag's Avatar
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    It wouldn't surprise me if it could by the NSA or the CIA. The safest way to destroy the data on a hard drive is to physically destroy the hard drive and then melt what's left over.

    Besides, a 35 pass erase on a modern hard drive could take days to complete.

    Regards.

  3. #3
    35 pass erase free disk space disk utility
    Santino's Avatar
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    I recommend you swap or destroy the HD if you're that paranoid to be thinking on a 35 pass erase.

    No offense, but as chscag said, deppending on the HD capacity it can go on for days until its done.
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  4. #4
    35 pass erase free disk space disk utility

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    actually guys its after a fresh re install. i am not bothered about time but just wondered if the info could ever be recovered with any technology. also what if the information that you want hidden was overwritten by the os. does this mean that it (or part of it) can be easily be obtained as its only been overwritten once by the os?
    all answers are interesting as this subject is very interesting

  5. #5
    35 pass erase free disk space disk utility
    Dysfunction's Avatar
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    After about 7 passes the chances of it being recovered are rapidly diminished. At 35 it's going to be very difficult and someone would have to have very high end equipment and be determined to do so. That being said, DOD standard is to do the multi-pass erase then physically destroy the disk. There are shredders made specifically for the task


    BTW the multiple passes overwrite in 0 and 1 patterns, multiple different patterns each time.
    mike
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  6. #6
    35 pass erase free disk space disk utility
    Doug b's Avatar
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    doug

  7. #7
    35 pass erase free disk space disk utility
    pigoo3's Avatar
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    Quote Originally Posted by gravitate View Post
    can the previous information EVER be recovered? Even with the highest technology ever invented?
    According to this Apple document:

    About Disk Utility's secure erase options

    The DoD (Department of Defense)...actually only requires a 3-pass erase:

    "The 7-Pass Erase option conforms to the DoD 5220.22-M specification. This specification calls for three passes, but Disk Utility performs seven."

    So a 35 pass erase (in addition to taking an ungodly amount of time to perform)...would way way exceed what the DoD requires!

    - Nick
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  8. #8
    35 pass erase free disk space disk utility

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    National Industrial Security Program - Wikipedia, the free encyclopedia
    As of the June 2007 edition of the DSS C&SM, overwriting is no longer acceptable for sanitization of magnetic media; only degaussing or physical destruction is acceptable.
    So it means the standard now is trash the drive and melt the remains into a sticky blob. Or alternatively you sit it on a desk and place a heap of Neodymium magnets above it. And screw the data on the drive that way.

  9. #9
    35 pass erase free disk space disk utility
    pigoo3's Avatar
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    Quote Originally Posted by the8thark View Post
    National Industrial Security Program - Wikipedia, the free encyclopedia

    So it means the standard now is trash the drive and melt the remains into a sticky blob. Or alternatively you sit it on a desk and place a heap of Neodymium magnets above it. And screw the data on the drive that way.
    Thanks for the updated security procedure. I think that the Apple document I linked was of OS 10.4 "vintage"...so looks like things have changed.

    It's certainly much more fun to come up with "physical" ways to make a hard drive unreadable...than simply running "Disk Utilities" over-write procedure 7 or 35 times!

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  10. #10
    35 pass erase free disk space disk utility

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    If you really, really don't want someone to find your old porn and 2008 tax return, take that disk and chop it in half with an axe.

  11. #11
    35 pass erase free disk space disk utility

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    If your axe swing misses the round data holding circle disk part of the hard disk then they might be able to take the data holding circle disk part, hook it up to another working drive and extract the data that way.

    But if you get axe happy and chop it into a million parts or use the magnets .

    But I like your way of thinking JJ. Woot! Let all your frustrations out with an axe.

  12. #12
    35 pass erase free disk space disk utility

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    Yes! A big magnet will work. If the rust particles on the platters are fully randomized, then I think recovery becomes impossible. But just to be safe, chop it up anyway.

    Then burn it.

  13. #13
    35 pass erase free disk space disk utility
    Slydude's Avatar
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    Wonder if this thread is sufficient enough to convince my wife that I need a blowtorch. axes are definitely out of the question since we have already had one unfortunate incident involving myself, a large kitchen knife, and a knife sharpener.
    Sylvester Roque Former Contributing Editor About This Particular Macintosh

    "Got Time to breathe. You got time for music." Denver Pyle as Briscoe Darling

  14. #14
    35 pass erase free disk space disk utility
    harryb2448's Avatar
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    To be doubly doubly sure toss the drive into a furnace. If it has sensitive information, cheaper to just replace.

  15. #15
    35 pass erase free disk space disk utility

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    Make it an atomic furnace just to be absolutely sure. That's also the green choice, since your hard disk becomes renewable energy!

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