Results 1 to 6 of 6
  1. #1


    Member Since
    Jan 07, 2009
    Posts
    8
    Erasing free disk space
    When I tried to do this my free memory went to near zero, I currently have 29Gb free, I stopped it because I was confused. What does erasing free space do? Can I still use the space? Or does it make it unusable?

  2. #2


    Member Since
    Jan 07, 2009
    Posts
    8
    Uhm... Anyone? Please?

  3. #3

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    22,101
    Specs:
    Imac 27" Retina 5K, 512GB flash memory, 3.3GHz, 16GB memory, macOS Sierra beta.
    This link explains it:-

    (Mac OS X 10.4): Erasing free disk space

    By far it is much easier to just select 'Secure Empty Trash' under Finder.

  4. #4


    Member Since
    Jan 07, 2009
    Posts
    8
    No it really doesn't.. It doesn't really answer my questions :l

    So at the end of the erasing the space I will have no free space at all? Thats crap..

  5. #5

    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Location
    Texas, where else?
    Posts
    26,484
    Specs:
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S
    Yes, it really does.

    There is no reason the average user would ever need to erase free space. Since you're not familiar with what it does, am pretty sure you don't need to do this.

    Both Windows and OS X, when you delete a file, the file is not actually deleted, only the pointer that tells the operating system where the file is located. The 'deleted' file is still there on your hard drive until such time as it is overwritten by new data and would be recoverable by most any data recovery software.

    Erasing free space writes 0's to the drive, essentially overwriting whatever data was 'deleted', in order to make it un-recoverable.

    If you do have a 'need' to do this, you must realize that it is writing 0's to all of the free sapce on the entire drive and should only be done while you are not using the machine. With a large drive, it could take a while to write 0's to the entire disk. Once the process has finished, all the free space will be returned to it's previous free space status.
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

  6. #6


    Member Since
    Jan 07, 2009
    Posts
    8
    Quote Originally Posted by bobtomay View Post
    Once the process has finished, all the free space will be returned to it's previous free space status.
    To be honest thats all I needed to know :l Thx

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. No free disk space after running erase free disk space in disk utility
    By Stumps80 in forum OS X - Operating System
    Replies: 3
    Last Post: 03-28-2011, 07:39 AM
  2. 35 pass erase free disk space disk utility
    By gravitate in forum Other Hardware and Peripherals
    Replies: 18
    Last Post: 03-27-2010, 09:14 PM
  3. Erasing Free Space
    By clint1986 in forum OS X - Operating System
    Replies: 6
    Last Post: 06-28-2008, 03:47 PM
  4. not enough free disk space
    By imacumacwemac in forum Movies and Video
    Replies: 3
    Last Post: 05-03-2008, 06:56 PM
  5. Erasing Free Space
    By iWonder in forum Schweb's Lounge
    Replies: 9
    Last Post: 07-29-2005, 04:40 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •