Disk Utility's "Erase Free Space" screwed me over big time. Help Please.

Hey, I have a serious dillema. I free'd up disk space on my mac by transfering files to an external drive, and then used Disk Utility to erase unused disk space to do a thorough cleaning. Now it seems that out of thin air, Disk Utility said my Mac is out of disk space....it basically filled up my hard drive with 370GB's of god knows what.
Here's exactly what I did, step by step:
Basically, I wanted to clean up my hard drive a bit, as I was using about 500GB's out of my 750GB HD (on my MBP 10.6.8)
-Before I did this test, I did a verify + repair disk permissions, I also organized my computer's files... and just to be safe, I booted up from the D key so I could do an extended hardware test to see if everything was running smoothly. I then zapped the PRam. This was my pre-clean maintenence check.
-Then I transferred all of my files onto my external disk.
-After this was done, I dumped the files (that I used to transfer to my External) into the trash bin.
-I emptied the trash bin.
-Now I free'd up hundreds of GB's of space.
-It said that I had 376 GB's of free space in my hard drive. Yay.
Now here where it all went wrong:
-I heard that if you go into Disk Utility, and click on "Erase Free Space" that it goes over all the delted files (that aren't actually permanently deleted) and it permanently deletes them so that it frees up all the loose ends on your mac. I didn't want any ghost files, or any old installs or whatever...so I thought, yes.
Now...Disk Utility was doing this for me....and 2 hours later....it said that I was out of disk space. Disk Utility froze around the 90% completion-mark when it was "Creating Volume" (or something like that) and I had to quit Disk Utility.
Then, I exited....went onto my desk top and checked my Hard Drive.
It said that I had ZERO KB's available.
My hard disk was completely full. How is this even possible? I had 376 GB's of EMPTY space 2 hours earlier.
I tried to go into all of my files to see if there were any duplicates made..I checked terminal to see what went wrong, I checked console...I searched, and I searched...and nothing.
What. The. Heck.
Can someone please, please help me?

Boot from your installation disc, erase the internal drive in Disk Utility, reinstall OS X, copy the files from your backup, and then run Software Update.

Similar Messages

Disk Utility Problems - Erase Free Space

Today I decided to use disk utility to "Erase free space " on my MacbookPro. During the process it said it was creating a temporary file!
This took about 2 hours then the application stopped responding, so I clicked skip and ended up doing a force quit!
Unfortunately, this task did not complete but it seems to have added over 10GB to my hard drive.
Any ideas how I can find the file and delete it or should I consider restoring my Mac to yesterday using my Time machine backups.
Thanks
Keith

However, does anyone have any advice on how to use the "Erase Free Space " Utility
This option should only be used when you've insecurely deleted a file you meant to securely delete, and should not be used on a FAT32 drive with 4GB or more free space.
(57218)

My external hard drive accidentally switched off during Disk Utility's "erase free space" process. I restarted the external hard drive and Disk Utility, but now I get the "couldn't mount disk" error when trying to finish the erase. Please help!

My external Lacie Quadra hard drive accidentally switched off in the middle of "erase free space", and when I switched it back on Disk Utility was hanging. So I Force Quit Disk Utility and restarted it. Now when I try to erase I get
"Secure Disk Erase failed with the error: Couldn’t unmount disk."
But "erase free space" seems to work...
What can I do? I'm erasing as I'm giving the drive to someone else and I wanted to wipe it clean.
Also should I use "erase" or "erase free space" if I want to wipe the drive clean?
Please help!

Sorry I don't really understand.... there are no partitions on the drive. How do I repartition it?
And should I use "erasing free space" or "erase" for wiping clean my drive of everything? Erase seems to be faster last tiem I tried.
Thanks!

HT3680 How to get my free space back after quitting the disk utility's erase free space

Hi,
I started the DU's erase free space--fastest way method. When it almost completed, I had a pop up that said that I need to free up disk space.
So then i was flustered enought to just quit the program because I didnt want to free up disk space and I was frustrated.
Not knowing it would still keep whatever it was that took the remaning disk space on my Mac.
How to I get this removed so I am back to before?

Sorry I don't really understand.... there are no partitions on the drive. How do I repartition it?
And should I use "erasing free space" or "erase" for wiping clean my drive of everything? Erase seems to be faster last tiem I tried.
Thanks!

Does Secure Empty Trash Accomplish the same task as Running disk util to wipe free space

Does using the secure empty trash option accomplish the same task as running disk util to eliminate free space from old deleted files? I'm currently running the 7 pass deal on my late '12 iMac. Says its gonna take 7 hrs. Can I use safari or iTunes while the Big Mac works its magic?

Does using the secure empty trash option accomplish the same task as
running disk util to eliminate free space from old deleted files?
No.
Finder > Empty Trash just tells the file system that those areas on the drive are now available for overwriting with new data. Data deleted off hard drives can be recovered if this method is used before it's overwritten with new data with special software.
Finder > Secure Empty Trash runs a 7x pass military approved overwrite only on the deleted files in the Trash, works for hard drives only.
Disk Utility > Erase Free Space creates a huge file that takes the remaining free space on the volume selected and either writes zeros or 7x pass, then confirms it and then removes the file. Takes a long time to complete, do not interrupt.
This can be used if one forgets to use Secure Empty Trash or wants to scrub caches or other files that don't necessarily go to the Trash for user deletion, such as program files that self delete and download cache files etc.
Only works for hard drives and there is no recovery possible for nearly all users. Those with special expensive magnetic equipment can possibly recover data off a zero pass, but not off a 7x overwrite.
The zero erase free space can be also be used to pre-eliminate potential unknown bad sectors on hard drives before wanted data is written to them, thus preventing future issues with data retention on hard drives.
Disk Utility > Erase - (not moving the slider) will erase all data on the volume or partition selected, including wanted data. It just tells the file system the deleted data is ready for overwriting. Thus can be recovered using special software before it's overwritten on hard drives only.
Disk Utility > Erase w/Security Option - (or moving the slider from the left) will secure erase all data on the volume or partition selected, including wanted data.
It can vary on the operating system version used from zero pass, to 3x overwrite, to 7x overwrite to 35x overwrite (old version for days past of smaller drives, don't use on newer larger drives as it will take weeks to finish.)
Secure erase methods are used to secure erase private data off of hard drives only, doesn't work for SSDs.
For secure data deletion off a SSD or any flash media, it's NSA advised to grind it into a fine powder.
How do I securely delete data from the machine?

Unusual hard disk activity after "Erase free space"

I have two partitions on my hard disk - a small partition for the system software and a big partition for everything else. A few days ago, I backed up a few files from my big partition and then used Disk Utility "Erase free space". Since then, my hard disk is behaving oddly. I can hear it, as if it continuously reading and writting data. At first, I thought it was an auto-update in progress or some sort of automatic system maintenance. But the odd behavior never stopped. I scanned my files with an anti-virus software - nothing wrong. I scanned my files with Disk Utility - nothing wrong. I used Onyx to check the system - nothing wrong. I even erased and reinstalled the system software - no changes! So what could possibly force my hard disk to behave like that? Is something messed up because of "Erase free space"?

You could run fs_usage
To view file activity for all processes with the fs_usage tool, you would enter the following at the Terminal prompt.
sudo fs_usage
If you wanted to limit the display to files accessed by a particular process, you could redirect the output through the grep tool. For example, to display file behavior for the TextEdit application, you would enter the following at the Terminal prompt:
% sudo fs_usage | grep TextEdit
Once your application finishes launching, stop fs_usage by typing Control-C in your Terminal window.
Look for all writes. Might be mdworker (Spotlight)
Try reindexing Spotlight by dragging the HD icon into the Privacy window. Leave it there for a minute and remove it using the minus button.

No Hard Disk Detected after Erasing Free Space

Hi ,
First I will explain the problem, I will be grateful for your help to solve it as immediately as possible. Thanks in advance !
I have a MacBook Black since 2007, with system specification, 160 GB Hard Disk, 1GB RAM, 2.16 GHz Intel Processor. I had a OS X 10.4.11 Tiger version. I need to upgrade it to 10.6 Snow Leopard. I bought OS X 10.6 DVD Snow Leopard version from Apple Store.
Last night, I save my all the data on external HDD, and tried to install 10.6, and it is installed over 10.4.11 with everything on the internal 160 Hard Disk. I did not want like that. I again started the installation process, I went to Disk Utility, I did some thing with partition, i.e. I created again 160 GB partition. Then I wanted to format, Then I saw some Erase Free Space and only Erase also, I click on Erase only, it is finished in seconds. but I was not satisfied. I saw button Erase Free Space then I click there, then , it takes about 90 minutes, and at the end, I saw a failure message that it could not create the temporary file or something like that I forgot what was written, however, it was a failure message ( it is failed to create etc ) .. ,
Then I saw, that there was nothing in the disk utility tool except the installing 10.6 Snow Leopard DVD. I was shocked, what happened.
Does some body could help me in this regard. How can I get the internal HDD with installation DVD ? What should I do after to erase everthing from my internal HDD, I mean , there should be nothing on it ..,
A big THANKS to you to solve this problem.
Best Regards,
Imran Khan
Macbook Black
1 GB RAM
160 GB HDD
2.16 GHz Intel

Yes, I just played with Disk Utility, and in the end, I found nothing.
With the installer DVD, when I came upto Menu List, I click on Apple in the upper left corner, There are many menus but in grey, I can't click on them, e.g.
About This MAc
Software Update...
Mac OS X Software ...
Logout ...
I can't click them ,
Just for Info, In the Utilities Menu, the list is as below,
Startup Disk ..
Reset Password..
Firmware Password Utility
Disk Utility
Terminal
System Profiler
Network Utility
Restore System From Backup,
Here I click on the System Profiler Menu, After that, I go into deep, there are hardware list,
In ATA ... it shows only MATSHITADVD-R UJ-857E .. in detail it shows about the installer 10.6 DVD
and
In Serial-ATA .. it shows Intel ICH7-M AHCI ..
I did not find anything about internal HDD of 160 GB.

Disk utility not erasing used space on external

Info on the 1 TB Lacie External drive reads:
Capacity 999.87GB
Available 999.21 GB
Used 663.6 GB
Why are the 663.6 GB used?
Please read what I've already done:
Deleted all items through finder
Emptied the trash
Securley emptied the trash
Erased the drive in disk utility
Erased free space in disk utility
Secure Erased the drive with the "most secure" US Department of Defense settings in disk utility
Erased and reformatted drive with a different format - MS-DOS (FAT)
Erased drive and formatted back to Mac OS Extended (Journaled)
Tried some steps involving the terminal and lost my mind (if you give me terminal answers please make it copy and pasteable).
Yet still...663.6 GB used.

Fair enough. I'm selling it though. Do these residual system files contain anything that would allow someone to roll the drive back and access my deleted data?

Disk Utility Shows Incorrect Free Space

I've had this problem for a while now, and I've been unable to figure out why. I can't even remember when it started, but it has become quite a nuisance.
The Finder window shows that I have 302GB of harddrive space remaining, out of 500GB. The Activity Monitor and Disk Utility show I have 240GB space remaining, and my System Profiler shows I have 239GB remaining. I just deleted a bunch of old TV shows off of iTunes (about 40GB worth) to open up some space, but only the Finder changed (up to 302GB from 260GB) but the Activity Monitor, Disk Utility, and System Profiler haven't changed.
Now, I'll assume the Finder is showing the correct amount of space, but I'm wondering why the other utilites are showing the incorrent amount of space. I have a feeling maybe something was screwed up when I created a 50GB Windows 7 partition through Boot Camp a couple months ago.
I've attempted to Repair Disk through the Disk Utility and it says everything looks fine. Any solutions to this minor inconvenience? Or at least an answer as to why this is happening?

The available disk space reported in finder is totally wrong.
Even if it accounts for the local snapshots. In my macbook air it shows 120 Available in finder which is just 1GB less than my SSD capacity.
https://discussions.apple.com/thread/4467217

I need to erase free space on my hard drive. But when I am in disk utility the format and name are pale as is the erase free space button so I cannot erase free space.

My start up disk is full. I have been through my computer and erased a lot of music and video to free some space. I then went to disk utility to erase free space and find that the erase free space button is pale and therefore won't work. Nor can I select or deselect MacOS extended journaled.
Advice please?!

Recovering Disk Space
If you have less than 20% disk space then it is time to roll up your sleeves and search for what you can delete and what you can offload to another disk.
If you have less than 10 GB you definitely need to delete or offload some files or purchase a lager disk or SSD (see below). You may want to maintain at least 20 GB of free space so when your disk starts filling again it will have some room before it hits that 10 GB mark again. More headroom is better. If you let the space fall much below 9 GB you might not be able to boot your machine.
Initial easy steps to gain disk space:
- Delete all files in the Downloads folder.
Empty the Trash.
- Start iPhoto.
Empty its trash.
Restart.
- Restart in Safe Mode:
Restart the computer.
As soon as you hear the chime press and hold the right shift key.
Be patient. Hold it down until you see the Apple icon.
Empty the trash.
Restart in normal mode.
- Delete "Recovered Messages", if any.
    Hold the option key down and click "Go" menu in the Finder menu bar.
    Select "Library" from the drop down menu.
    Library > Mail > V2 > Mailboxes
    Delete "Recovered Messages", if any.
- Empty the Trash.
- Restart.
- Re-index your system disk (Macintosh HD):
http://support.apple.com/kb/ht2409
Time Machine Snapshots:
If your disk is 80% full that is normal. Time Machine uses up to 80% of the disk space for local snapshots. To get rid of these snapshots simply plug in your Time Machine backup drive and run a backup. See About Time Machine's 'local snapshots' on Mac notebooks: http://support.apple.com/kb/HT4878 and What are Local Snapshots? http://pondini.org/TM/30.html .
If you are concerned that the “Other” category of disk usage is taking too much space and for information on deleting files then look here: https://discussions.apple.com/docs/DOC-5142
Backup:
Run a Time Machine (or other) backup since you are about to delete and move files and you may need to recover from any inadvertent mistakes or decisions. You will need one external hard drive for your Time Machine (or other) backup and a second if you plan to offload some files. (See suggestions for where to purchase hard drives at the end of this message.)
For more about backups:
Time Machine Basics: http://support.apple.com/kb/ht1427
Most commonly used backup methods:
https://discussions.apple.com/docs/DOC-3045
Methodology to protect your data. Backups vs. Archives. Long-term data protection:
https://discussions.apple.com/docs/DOC-6031
Deleting files:
Then use the free application OmniDiskSweeper http://www.omnigroup.com/more to explore your volume in descending order by size so you can attack the problem from the top down, deleting the largest unwanted files first. Delete with caution and do not delete any system files. Remember to empty the trash after trashing the files.
Additional reference on freeing disk space:
http://pondini.org/OSX/DiskSpace.html
Offloading files:
Consider moving some of the no-often-used large files or directories to an external disk. Use ODS again to find them. As noted above this will be at least your second hard drive. Your first one(s) is/are for your Time Machine (or other) backup(s). Do not offload files onto a Time Machine disk.
Format the second drive as Mac OS Extended (journaled). Using OWS to find large files/folders and copy them from the system drive to the external hard drive and delete them from your internal drive.
Then  > System Preferences > Time Machine > Options… > Remove the offload HD name from the exclusions list.
Now both your system disk and your external offload disk will be backed up onto your Time Machine disk.
From: http://www.thexlab.com/faqs/freeingspace.html
To move your iTunes Music folder to another disk or partition:
To change the location of your iTunes Music folder, carefully follow the instructions in the AppleCare® Knowledge Base document "iTunes for Mac: Moving your iTunes Music folder."Additional information can be found in iTunes Help.
http://webcache.googleusercontent.com/search?q=cache:http://www.thexlab.com/105/ 00000849.html
Laptop users may want to consider having two iTunes libraries: a small library of current favorites on their computer, while their complete library resides on an external hard drive. Utilities like iTunes Library Manager enable you to easily have multiple iTunes libraries you can use with your account. https://www.macupdate.com/app/mac/7689/itunes-library-manager
To move your iPhoto Library folder to another disk or partition:
To move the iPhoto Library folder to a new location, employ the instructions in the AppleCare Knowledge Base document from http://support.apple.com/kb/PH2506 corresponding to the version of iPhoto you are using. Additional information can be found in iPhoto Help.
Laptop users may want to consider having two iPhoto libraries: a small library of current, favorite photographs on their computer, while their complete library, or archives of older photos are saved on an external hard drive. Utilities such as iPhoto Buddy and iPhoto Library Manager enable you to have multiple iPhoto libraries that you can use with your account.
https://www.macupdate.com/app/mac/12175/iphoto-buddy
https://www.macupdate.com/app/mac/7158/iphoto-library-manager
Hardware — Bigger disk/SSD:
If your system has upgradeable storage then if you are still tight on disk space consider larger storage. If you have a disk consider replacing it with a one TB disk. Check out a one terabyte HGST 7K1000 7200 rpm, SATA III drive from OWC http://eshop.macsales.com ($100). If you have an SSD consider increasing its capacity to 240 or 480 GB. A standard 240 GB SSD would cost from $200 to $280. See OWC and Crucial: http://www.crucial.com/ for options. OWC sells 120, 240 and 480 GB SSD upgrades for MacBook Airs. A 240 GB upgrade costs $265.   http://eshop.macsales.com/shop/SSD/OWC/ . If your Mac is under warranty or AppleCare replacing the SSD will void the warranty.
PlotinusVeritas gives some great suggestions for purchasing external hard drives in this thread:
https://discussions.apple.com/thread/5602141?tstart=0

Disk Utility - Erase Free Space-what does it really do?

Hey Forum,
I am using mac os 10.6.4 on my macbook and i have a doubting question for quite sometimes, what does disk utility erase free space feature really do? Does it gives you more free space? or what? I know it prevents the recovery of deleted files but i want to know what more it does and do not do? Like, now my hdd free space kept increasing and decreasing, by a few 100 mbs or 50mbs etc, so do i erase free space so to solve this problem? Ok, i do not only want to know does it solve the previous problem, but also the questions stated in the whole long paragraph i have wrote. If you know anything related to disk utility's erase free space, feel free to tell me!
Pls help me, I need you guys' help!
Thank you.
Regards
Ala.

Erase free space simply writes zeros over the space occupied by deleted files to prevent data recovery. That's all it does. It does not give you extra disk space.
Your disk space goes up and down a bit because the system creates temporary files and logs which take up space, such as the Safari cache. You can clear these file using a utility like Onyx (which is free)

Disk Utility: Disk Scrubbing ("Erase Free Space")

Hi,
I've logged in case 113969827 the following observation:
In a Macbook 10.5.6 using Disk Utility to Erase Free Space
(Disk Utility / Erase / Erase Free Space) with 7-Pass or 35-Pass
Erase on a / partition with 113GB free of 200GB of a 232GB drive
which is Boot Camp partitioned, the other 32GB going to a
flawlessly-running Windows XP, rarely used, the following
issue happens...
The free space (87gb) goes to 0gb.
Has anyone else seen this?
Thanks.
Message was edited by: cracraft

Hey,
Talked with Apple in Texas, Indiana and Silicon Valley on this one
as well Josh...
The bottom line executed so far is:
Shutdown Mac OS X
mount -uw
/usr/sbin/fsck -fy
shutdown -r now
Finder
Disk Utility
Erase / Erase Freespace
Select least secure option and run
Wait until Disk Utility is final (no timing messages)
The above completed okay and your advice to "wait it out"
was right on the ball.
Next, I need to do Erase / Erase Freespace 7-Pass overnight
and then a 35-Pass tomorrow.
The reason I want to do all this heavy "assurance" of deleting
is that if I am required to send this notebook back for the cpu
fan issue, then I certainly want privacy for my disk. But on second
thought, upon receipt, I could just go to the local Apple store and
swap out the disk from one and place it in the new frame and
bootup, retaining my data.
Anyway, thanks for your input today as well as Richard in Indiana,
Matt in Texas, Matt in Silicon Valley.
(There were no errors in the fsck btw though it did say the FS was
modified... odd.)
Stuart
P.S. One would want to do more than the drag-and-drop to the Trash
with Empty Trash btw. I don't think those are assured from undelete
by savvy wizards or other operatives... whereas, 35-pass certainly is
completely secure, assuming the implementation at Apple doesn't
have a backdoor of some kind...
I'll keep this thread updated after the 7-pass / 35-pass which I am
sure just requires extra patience, as you indicated. Thanks!

Disk Utiility Erase Free Space Inconsistencies

About a week ago I used Disk Utility to erase free space on my HDD. I set it to the 7 pass option and ran it in the evening before I went to bed. When I got up in the morning the task had been completed and Disk Utility indicated it had taken 2 hours.
Last night I did the same thing, but this morning I found that Disk Utility was still running the task on my iMac. The little progress bar indicated only half of the job had completed and it said estimated time 3 hours -- this is after it had already been running 8 hours.
I have about 70GB free space.
Why is this taking so long, particularly considering it did the same thing in 2 hours a short time back.

You might have some disk corruption. I suggest you back up your important files to a different disk first. Then repeat what you are trying to do and see if the console manager shows any errors or just get a copy of Disk Warrior and run it.

Erase free space issues?

I am using fully updated Yosemite on two iMacs, one office, one home, and recently began having this problem: When I use Disk Utility to erase free space, the window first says it is creating a temporary file and then very quickly starts the erase process with the progress bar. This takes hours, so I usually "fire it and forget it" — let it run overnight or when I will be away from my desk. Occasionally I'll stay at my desk or return after a while and note that the erasing seems to be progressing normally. When I find that the process is finished, I see a message to the effect that the erasing couldn't be completed because the program could not create a temporary file.
Has anyone else encountered this contradiction? Is it an erroneous error message or has the free space really not been erased? Thank you.

Erasing Free Space Will Definitely Help Me and My Situation. Plus I've deleted or transferred files to an External HD, a ton of files(About 75%). And still the hard drive is reading FULL. The Erase Free Space Option just isn't working for some odd reason. So Erase Free Space Is Definitely What I'm Looking For. Any think you can think of, why it's not working properly?? And thanks for you speedy response also.

"Erase Free Space" work-around for non-apple ssd

for those of you attempting to "Erase Free Space" per knowledge base article:
"OS X Lion v10.7.3: User account passwords appear in log files for Legacy FileVault, and/or network home directories"
quote:
"6. Open Disk Utility.
7. Select your OS X Lion volume on the left.
8. Click "Erase Free Space…".
9. Select the Erase Free Space Option you want and click "Erase Free Space". Enter admin name and password if prompted."
but instead seeing a grayed out "Erase Free Space" in Disk Utility?
you can perform an "Erase Free Space" by using WipeFS app by Jonathan Clark which can successfully perform a DoD (Department of Defense) wipe for digital media, apple's Disk Utility doesn't do this anymore with non-apple solid state drives (ssd)
references:
https://support.apple.com/kb/TS4272
http://itunes.apple.com/hr/app/wipefs/id484887048?mt=12

...but instead seeing a grayed out "Erase Free Space" in Disk Utility?
See,
Mac OS X: About Disk Utility's erase free space feature
which says,
Note: With OS X Lion and an SSD drive, Secure Erase and Erasing Free Space are not available in Disk Utility. These options are not needed for an SSD drive because a standard erase makes it difficult to recover data from an SSD. For more security, consider turning on FileVault 2 encryption when you start using the SSD drive.
Also google "erasing space on ssd".
Bottom line, it is not something you want to do to a ssd.

Disk Utility's "Erase Free Space" screwed me over big time. Help Please.

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