Wiping free space on an OS X volume

Discussion in 'macOS' started by pmartin, Aug 30, 2006.

  1. pmartin macrumors regular

    Apr 23, 2005
    Hello, I was just wondering if any of you knew of a program that can wipe the free space on a hard drive (overwriting with zeroes is all that's necessary, even if it's not that secure.)
  2. Mitthrawnuruodo Moderator emeritus


    Mar 10, 2004
    Bergen, Norway
    Disk Utility.

    You'll find it in /Applications/Utilities/

    Just look under the Erase tab. :)

    Attached Files:

  3. pmartin thread starter macrumors regular

    Apr 23, 2005
    /slaps head :eek:

  4. userXMZ macrumors newbie

    Jun 10, 2009
    File slack

    Apple's Disk Utility, however, does not seem to wipe file slacks when wiping free space, resulting in an incomplete erase of free space. File slacks is the space after a file's data ends and until the file system block ends, and on a modern harddrive it can constitute gigabytes of data. Forensic investigators frequently find interesting information in file slack.

    To wipe free space AND file slack, you need to use Jetico's BCWipe.

    For a tutorial, see http://wipeosx.wordpress.com/
  5. 2012Tony2012 macrumors 6502a


    Dec 2, 2012
    Does Jetico's BCWipe work on imac? And is there a free alternative?
  6. Mr. Retrofire macrumors 603

    Mr. Retrofire

    Mar 2, 2010
    AFAIK, this is no problem on HFS+ volumes, because (Mac) OS X writes zeroes in each block before it writes the data in the block. (Mac) OS X does this since Mac OS 8.1 (no, not 10.8.1).

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