OS X :: Zeroing Out Disk - Erase Disk Isn't Supposed To Be Completely Empty?
Aug 7, 2010
I bought a used mac and when I erase the disk, afterwards it still shows 2 files and 2 folders on the disk taking up 40+mb of space. What is that? When you erase the disk isn't it supposed to be completely empty?
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Jun 13, 2012
I want a brand new OSX installatetion. What is the best way to completely erase my SSD (to make it brand new) and reinstall MAC OSX (i can use internet WPA secure Wi-Fi to reinstall MACOSX Lion). On macbook air late 2011.
Info:MacBook Air, Mac OS X (10.7.1)
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Sep 7, 2009
Anyone knows why my external HD (USB disk connected to Airport extreme) does not show up in disk utility? (It sits on my desktop just fine and is fully functional) I' want to erase a partition but now i don't know how.
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Jun 18, 2012
Installing Imac back to factory settings, erase disk shows could't unmount disk how to solve
Info:
MacBook Pro, Mac OS X (10.7.4), I bought a usb stick with the OS Xa
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Dec 15, 2010
I'm having a pretty serious problem. I attempted to erase the free space on my HD, as I do from time to time, except this time it appeared to hang/freeze at the end, when it gets to the part where it creates a temporary file. I waited for several minutes and it didn't move. I tried clicking the skip button, but that did nothing either, so I force quit Disk Utility.
The problem is, it left the disk at "Zero KB" of free space, effectively making my computer inoperable. I was in the process of studying for a huge exam tomorrow, and am currently flipping out.
If it matters, I'm on a Macbook Pro 2.33 GHz Core 2 Duo, running 10.4.
I really don't want to have to reinstall the OS and import the old files, but my real fear is that I will have to do a fresh install of the OS.
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Dec 15, 2010
I'm having a pretty serious problem. I attempted to erase the free space on my HD, as I do from time to time, except this time it appeared to hang/freeze at the end, when it gets to the part where it creates a temporary file. I waited for several minutes and it didn't move. I tried clicking the skip button, but that did nothing either, so I force quit Disk Utility.
The problem is, it left the disk at "Zero KB" of free space, effectively making my computer inoperable. I was in the process of studying for a huge exam tomorrow, and am currently flipping out. Any help would be greatly appreciated.
If it matters, I'm on a Macbook Pro 2.33 GHz Core 2 Duo, running 10.4.
I really don't want to have to reinstall the OS and import the old files, but my real fear is that I will have to do a fresh install of the OS.
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Jan 28, 2008
I am having trouble erasing DVD+RW discs. When I insert a used disc and try to erase it in Disk Utility, the process seems to complete almost immediately, ending with OS X asking me if I want to mount the inserted blank disc in Finder. However, if I eject the disc and put it back in, everything is still on there. (detail: When erasing, there is usually a short interval where a striped progress bar is shown, after which a "normal" progress bar is slowly filled as the disc is erased. However, for me only the striped progress bar is shown--the "normal" progress bar is skipped--and then OS X says erasing is done.) If instead of ejecting the disc I choose to go ahead and burn something as if Disk Utility has actually erased the disc, I get a laser power calibration error.
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Apr 22, 2009
I need to erase a disk I bought with NO formatting. I shouldn't have initialized it when I connected it, and now I need to erase it but do NOT want to format it.
I've been trying to use diskutil eraseDisk %noformat% /dev/disk1
Like the diskutil eraseDisk instructions tell me to, but it won't take.
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Aug 11, 2009
I have been reading that the erase feature on OS X's disk utility will not remove file slack. If I erase the entire drive using one of the security options (Zero-Out, 7-Pass, or 35-pass),
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Oct 9, 2009
I recently installed and uninstalled a few versions of linux on my imac. After installing some versions i realized I was going to need more space, so I went back into mac OSX and have been trying to add a new disk partitions with more GB.
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Feb 24, 2012
I have a Macbook Pro 2.1 GHZ with 2GB of RAM from 2006 with Mac OS X 10.4.11 (Tiger) and I bought Snow Leopard (Mac OS X 10.6.3). I want to install the new OS but I had some problems with this process. Do I have to erase my hard disk first and then install Snow Leopard? I want to keep my documents on my hard disk and the programs that I have.
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Feb 10, 2009
i was Erasing Free Space in Disk Utility, after a while I needed to Force Quit another program but I mistakenly quit Disk Utility and now it says I only have 3.1 GB space available when it should be around 270 GB available. I'm sure Disk Utility said it was 'Creating Temporary File' at this time this happened.
I'm now also getting a message which states I need to clear out space on my start up disk.
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Jul 1, 2009
Sso something went wrong when I was installing leopard and it said that I had to erase and restore the disk or something like that. Now I know exactly how to do this but what I am wondering is will this completely delete everything on the disk all the applications and such? It has tiger on it right now so after I erase it will tiger be gone so i wont be able to put leopard on? How does this whole erase thing work?
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Aug 28, 2009
I would like to know the difference between the options 'erase' and partition' in disk utility. Under 'erase' there are several options: under 'security options' there are 4 options: don't erase data, zero out data, 7-pass erase and 35-pass erase.
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Nov 7, 2009
i just erased my external hard drive through disk utility my accident. I had VERY important files and the 1tb was full.
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Aug 31, 2010
I am selling my 6 months Macbook pro and I would like to delete everything very securely. I would normally do a fresh install and then use disk utility to erase all date on a 35 pass. However I do not have the installation disks. I am not the best at using a mac but could someone tell me everything I have to delete and the steps I must take before I do a 35 pass erase in disk utility? I have noticed in console that I cant delete 'Diagnostic and usage messages'. I have gone through Finder then deleted the applications and gone to application support and deleted what I have seen but is there anything I am likely to miss being a non techy guy? I don't want to leave anything at all on the mac in the slightest.
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Oct 18, 2010
I interrupted the erase free disk space function and I ended up with zero kb of space left on my HD. I have tried to find the EFTFile1.sparseimage file to no avail. I have also tried deleting other files in order to "flush out" the trash and hopefully open up the rest of the space, but that didn't work either.
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Sep 23, 2008
I purchased a 32gb usb flash drive from ebay. I transferred some music on there, it crashed half way through transferring.
When I restarted and plugged it in, it didn't appear on the desktop. I went into Disk Utility and tried to erase it, I get the following error:
Disk Erase failed with the error:
Input/output error
So I then tried the following in Terminal:
diskutil eraseDisk HFS+ newdisk disk2
But got the following message:
Partitioning encountered error Input/output error (5) on disk disk2 NO NAME
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May 3, 2009
I just ran the Erase Free Space thinking it would help me with a bootcamp issue.
I had 70Gb free and I stopped it when I noticed i had 30 Gb free left. So I just lost 40 Gb of hard drive space. What happened? is there anyway of recovering it or did I just make a huge mistake.
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Aug 4, 2009
I'm booted on a MacBook Pro from an external drive, and I want to erase the drive inside the MacBook using Disk Utility from the external. For some reason or another, it won't let me do this. When I click on the Erase tab (whether clicked on the disk itself or the volume "Macintosh HD") and try to erase it, it returns with the error:
Disk Erase failed
Disk Erase failed with the error: Could not unmount disk.
When I try to install an image onto the drive, I get a similar error, except it says "Operation not permitted." When I tried it while booted with an OS X DVD, it worked fine. As far as I know, I should be able to do this while booted from the external HD.
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Nov 10, 2009
I'm trying to format my disk due to an error with boot camp. However, I cannot push the erase button as shown below.
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Feb 27, 2010
My Computer: 2.8 GHz intel Core 2 Duo Mac, running OS X Ver. 10.5.8. I've partitioned my hard drive before, but in order to get more space on my Windows partition I have made a disk image using a program called Winclone. I also backed up important files to my external hard drive, and then used disk utility to erase and make a new partition so I could restore the Winclone disk image I made and have everything back. What I'm concerned about is I've been waiting for this new partition (65 GB) to finish being made and its taking a while. I read that if you stop the process it could damage the OS X side and you could lose all your files.
I started to run time machine about 10 minutes ago and set the destination to my external drive for backup (Its a huge drive, it can hold 650+ GB so I'm not worried about running out of space.) Do I stop Disk Utility and risk it? Do I let it run? Do I kiss my computer goodbye and pray that Time Machine backed everything up right onto my external hard drive? I don't know if Time Machine is working correctly because I started it after I began to partition my hard drive. What to do. Should I let Time Machine back everything up, the disconnect my external and end Disk Utility?
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Feb 26, 2012
I am trying to reinstall Lion on my macbook pro, but every time the hdd shows up as 'locked' and when I attempt to format it, it gives me a "volume erase failed with the error - cannot unmount disk" message. It appears as if some files withing the disk are still running but I have no way of quitting them-knowingly. I can specify more if this seems to vague.
Info:
MacBook Pro
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Apr 25, 2012
I'm unable to erase a disk/volume so that I can migrate. The only thing it's allowing me to do is erase free space. I am using MacBook 10.6.8 and migrating to a different MacBook using 10.6.8.
Info:
MacBook, Mac OS X (10.6.8)
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Jun 25, 2012
I have a MacBook Pro which was originally supplied with OS X10.4.9. I have upgraded using disks purchased from the Apple store to 10.5 and subsequently 10.6. More recently I upgraded to 10.7 using the download from the online App Store. I would like to perform an Erase and Install to get rid of the 'dross' on my hard disk and may do this as part of the 10.8 upgrade although have yet decide whether to wait for this or not.Â
when doing the erase and install, do I have to start from scratch by loading the original 10.4.9 OS X version or can I start at 10.7. If the latter how would I do this given that I don't have a disk as it was downloaded from the App Store?
Info:
MacBook Pro, Mac OS X (10.7.4), 2.4 GHz Intel Core 2 Duo
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Dec 2, 2014
Cant erase hard drive because cant "unmounted disk"...My hard drive crashed about a month ago, and i used a program called data rescue to clone hard drive. when i put it in mac it will not load. now all i want to do is erase the drive and install Yosemite as new mac. but cant install or erase the hard drive.
Info:
MacBook, Mac OS X (10.7.5)
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Dec 7, 2014
How do I recover the data after erase the Macintosh HD disk and also reinstall the system?My laptop could not be turned on last Wednesday, but I needed to finish up my assignment and submit on Saturday.I searched online a way to keep my data but the laptop could be fix up.
Under disk utility, I erased the Mac OS Extended (Journaled), then reinstalled the system.It's said that in this way my data will be all kept, but when I finally got my laptop turned on.All my data was gone including my files, applications, and so on.
Hardware Overview:  Model Name: MacBook Air Model Identifier: MacBookAir4,1 Processor Name: Intel Core i5 Processor Speed: 1.6 GHz Number of Processors: 1 Total Number of Cores: 2 L2 Cache (per Core): 256 KB L3 Cache: 3 MB Memory: 2 GB Boot ROM Version: MBA41.0077.B11 SMC Version (system): 1.74f4
Info:
MacBook Air
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Mar 24, 2012
I keep getting a message when trying to update my computer saying my start up disk is full. I have deleted my trash can, a lot of photos and videos I had, and I don't have many files or apps. When I look at the startup disk it says that the memory is being used by "other" How do I find the "other" files?
Info:
MacBook, Mac OS X (10.7.2)
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Dec 25, 2010
I got a second hand macbook pro on tuesday, it is the 13" 2010 model and is two months old. However it keeps causing me all kinds of problems, and I am not sure if it is my fault, a hardware fault or something else. I'll describe what I've done to it; When I got it I wiped the hard drive and did a clean install of OSX, then I imported everything from my old mac through migration assistant. However when I then started using my new mac, the 'home' folder was a different name so some files didn't match up, like my dropbox account and some games. I don't know if this has caused other problems within the directories or anything like that.
It is usually fine for about 6 hours, it's pretty quick and I have been through disk utility in this time and the verify process has been ok. However after this time the it starts being really slow. Like I'm talking 10 - 15 minutes to open an application. Every time this happens I open disk utility to check on it, and it always needs to be repaired as there are folders and directories missing. However when I turn it off and go into disc utility through the install disc it doesn't let me repair it as the drive cannot be unmounted, but then the HD disappears from disk utility completely.
On top of this I tried to install XP through boot camp earlier, but the partition wouldn't format, so I went back through boot camp assistant and deleted the partition. However whenever I turn it on I have to hold down the command key and select the Macintosh HD, because if i don't it tries to boot into windows, even though the partition has been deleted and the HD merged back into the Mac HD. When I boot through the command key, the only option there is the Mac HD, so I don't know where it is getting windows from.
The battery is not what I expected in this thing either. I have put this on another post but I wanted to complain about it again. I have noticed that on a full charge i only get 6 - 7 hours browsing the internet, way off the 'approximately 10 hours'. When I go into istat menus apparently it has a cycle count of 68 and the health of the battery is 89%, which seems very low to me. Whenever I do manage to get it to turn on, it never remembers my settings for the back lit keyboard or the screen brightness. They are always on full whack even though I turn them down to half every time I use it.
Basically, on this fine christmas day (don't get me started on that, the dog got more presents than I did and now my mum is singing Susan Boyle at the top of her lungs) I was wondering if any of you could help me with these problems? I'm thinking I may just have to wipe the HD again and reimport everything manually but I really don't want to do that. I do love Apple Macs and I don't want to get rid of this thing, but it is driving me mental. I turned the Macbook Pro on when I started writing this on my old Macbook. It is now 8 minutes later and it has still not booted. It is just sat there looking all smug with the spinny thing below the apple on the grey screen.
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Oct 17, 2010
I have an external hard drive that was used on a PC. I want to use it on a Mac. I went into disk utility and did an erase. (Extended Journaled and in security options changed it to zero out data). I can now use it on the Mac how ever it is telling me that there is 54.1 MB of used space. I want to have access to this. How do I do it?
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