OS X Mavericks :: Unable To Repair Or Unmount Disk To Reformat
Jun 20, 2014
I have a Macbook pro 17" (2011) running Mavericks with a Crucial 960Gb SSD and a 750Gb WDC in the optical bay. My ssd is divided into 710 Gb to OS X and 182 Gb to Windows 7 Bootcamp. All was well until the other day when the OS X partition failed to boot. I got the grey screen and the very slow progress bar which after 15 minutes powered the machine off. The Bootcamp partion continues to work without issues. I booted from an install disk and ran disk utility. The OS X partition appears greyed out on the left panel. I attempt a repair disk and after a 15 minute delay it says it is unable to repair the last action being "updating boot support partitions for the volume as required". Its all backed up regularly on time machine but when I boot an install usb and attempt to restore from time machine, the OSX disk does not appear as an option. I go back into disk utility and attemp to erase/repartition the disk to start a new install but it refuses to unmount. I appear to be running out of options,
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Jul 17, 2009
So so annoyed right now. Today my 12" G4 powerbook started to become slow, lots of spinning wheel, delayed menus etc. I checked file permissions, rebooted and it just kept on getting slower. Eventually it wouldn't get past the white apple screen.
I booted off the Tiger DVD and ran disk utility to fix and repair permissions again. It wouldn't let me repair the disk as I kept getting this error:
'Repair volume failed with error could not unmount disk'
I had to reboot again, and eventually my hard disk no longer appears in Disk Utility. I tried to boot into safe mode and get this:
'"I0ATAController device blocking bus
I0ATAController device blocking bus
I0ATAController device blocking bus
I0ATAController device blocking bus
I0ATAController device blocking bus"
So now I pretty much can't do anything with it. Failed Hard Drive?
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Aug 29, 2014
I wanted to do a clean install and repartition my iMac running 10.8. It has 2 partitions. I booted from the recovery disk, went to Disk Utility and erased the two partitions. However, when I tried to change to a single partition got the error message "cannot unmount disk."
Info:
iMac, OS X Mavericks (10.9.4)
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Jun 22, 2008
I have a Western Digital 500gb external hard drive, with 2 partitions, 'KAINARC' and 'JUNGLEMAC', connected to my Intelmac (Tiger 10.4.11 via my firewire, i have connected via usb but the problem is still the same). I may have shut down the drive improperly to cause this situation.
KAINARC now appears on my desktop, but the partition of JUNGLEMAC does not. I go to disk utility and both partitions are visable, KAINARC is mounted but JUNGLEMAC is not. I cannot mount JUNGLEMAC.
When i try to verify and repair the partition I get the message:
Verify and Repair disk �JUNGLEMAC�
Error: The underlying task reported failure on exit
1 non HFS volume checked
1 volume could not be repaired because of an error
So I try to verify and repair the partition KAINARC but get this message:
Verify and Repair disk �KAINARC�
Repairing disk failed with error Could not unmount disk
So I have opened diskwarrior (unbelievably long time to start up and scan disks) in the hope of fixing the hard drive, but when i try to repair I get the error message 'unable to unmount KAINARC'.
I have tried other repair/recover programs but get the same message: 'Could not unmount disk KAINARC'. Im asuming that to fix the hard drive it has to be able to unmount KAINARC.
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Sep 12, 2014
Macbook Pro running on OSX Mavericks is having problems.
Today I turned my Mac on, and it started up with a loading wheel and a loading bar. When the loading bar finished, the Mac turned itself off. I tried many times, same happened every time. I then went into OSX Recovery, started repairing Macintosh HD, but the error message saying "Disk Utility can't repair Macintosh HD" came up and now I don't now what to do.
Is there any way I can back up my files in this situation? Is there any way I can repair the disk without having to erase all data and reinstalling OSX? Or do I really need to bring it to a Apple Store for repair?
Info:
MacBook Pro, OS X Mavericks (10.9.4)
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Aug 22, 2014
Is it possible to reformat a single partition of a disk w/o reformatting the entire disk?Or must one reformat the entire disk? In DU, If I click on the volume/partition in question, I do NOT get the tab “Partition.” If I click on the disk, not just the volume/partition in question , then I do get the tab “Partition.” Also, does using DU to secure erase a volume by overwriting with 0s, cause a format issue? Some details on my other post:Create a bootable clone using Disk Utility
Info:
iMac, OS X Mavericks (10.9.4), 4 GB RAM, Win XP Pro-Boot Camp
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Apr 11, 2010
I am considering purchasing diskwarrior but want to make sure it can help my situation before I purchase it. My imac will not boot from the internal hard drive (Intel processor) When I use disk utility to try and repair the disk, I get error messages and it won't repair. I can see the HD but cannot repair it. When I connect using target mode with my mac book pro, the hard drive does not appear on my host (macbook pro) computer. I have reloaded OS X (Leopard) onto a firewire external drive and can boot my imac that way but I can not find my original internal Macintosh HD. Will disk warrior be able to help with this scenario. I would really like to access that internal Macintosh HD and retrieve my files.
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Jan 2, 2010
Running Diks Util on my iMac 10.6.2. i am given this warning.
=========
Warning: SUID file "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent" has been modified and will not be repaired.
Is it something I should heed and what to do in that case?
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Aug 21, 2010
When I open Disk Utility and select one of the 2 volumes in the left pane, the buttons "Verify disk permissions" and "Repair disk permissions" remain greyed out. Only the "Repair disk" and "Verify disk" buttons are enabled. This is not the startup Volume. For this volume all 4 buttons are enabled.
How can I repair the disk permissions on the volume?
I have Mac OS X 10.6.4
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Dec 11, 2009
I have a MacBook with 3 partitions. One has Snow Leopard (Macintosh HD), Tiger and Windows 7On Snow Leopard I tried to backup files to my external Hard Drive but some files wouldn't transfer. When I clicked on the folder that was unable to transfer, everything went out of control. All windows started opening themselves and I had to shut down my MacBook by the power button.
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Mar 14, 2012
Lately, my MacBook Pro (mid 2010) started to slow down even with over 60% disk space is empty and max RAM is installed. It gets slow when using hungry programs such as Photoshop CS5.
I used the disk utility first aid and fixed all permissions that were shown with errors. When scanning the disk, I received the message that my disk is corrupt and I need to fix by restarting with command+R keys pressed until the apple symbol is displayed. When the next window shows up, choose disk utility and go from there to fix the disk.
When I performed that, I let go of the Command+R keys after the apple logo came up, the only thing that came up after that was a grey circle with a diagonal line through it and a spinning clock.
Info:MacBookPro, Mac OS X (10.7.3)
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Apr 2, 2012
I am unable to verify or repair my second partition on my Macbook.I do not get any error codes.
Info:MacBook, Mac OS X (10.4.11), Mac OS X Tiger Unable to verify or repair disk
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Jun 4, 2014
I just got a new Imac last week. When I try to go into Command + R the repair mode it looks like it changed to a reinstallation mode which is what I don't want. Is there another way to run disk permissions or disk repair in Mavericks?
Info:
iMac (21.5-inch, Late 2013), OS X Mavericks (10.9.3)
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Jan 24, 2010
I HAVE AN EXTERNAL 1TB LACIE FRIVE AND I UNPLUGGED THE DRIVE IN ERROR AND NOW DISK UTILITY SAYS UNABLE TO REPAIR DRIVE AS FOLLOWS
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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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May 20, 2009
I'm having a series of problems. First some intermittent audio problems with Garageband, then, then some external drives won't mount, and now I can't sync to my disk from the iMac. I've run Disk Utitilies a few times and when I do Verify Disk Permissions, it finds a list of things to fix, I then hit Repair Disk Permissions and it fixes them, and then hit Verify Disk, and it say the disk appears ok. When I do Verify Disk Permissions again though, it finds another long list of things to fix. Is this serious? What should my next step be? Should I reinstall the entire system?
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Oct 11, 2009
My Macbook is starting to get really slow. I've tried Onyx and it told me that the startup volume had to be fixed. But I can't boot my install DVD by pressing "C" in the startup.
Is there another way to repair the disk?
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Apr 2, 2012
I'm having trouble with a couple of SD Cards.I cannot delete files or modify them (they are set to read-only), and when I run a verify scan in disk utility, it sais they require repair, but repair is grayed out.I also cannot reformat.What can I do to just wipe these 2 cards and reformat them?I already have all the necessary data backed up.
Info:
MacBook Pro (13-inch Mid 2009), Mac OS X (10.7.3)
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Feb 1, 2009
last week my mac (1 year old iMc, 2.4ghz intel chip, 4gb ram, system 10.5.7) went all funny, everything was working slowly - so I restarted, same thing, I restarted again and it just went to the grey screen with the spinning ball.Ok so I restarted from my tiger disk and it could see the drive, so I tried to install a new system and it got right to the end of the installation then said because of a disk error it couldn't do it.
Ok so I bought an external HD, put a system on and started up from there - now the drive came up, but things were slow still, it took forever to copy anything so I tried disk utility, it couldn't repair it. I tried drive genius, same thing. DiskWarrior 4.1.1 same thing.
Now I tried again a few times and the programmes took forever to start up but now disk utility opens after about 30 mins and can see the drive, but it's lost it's name and I can't even repair or repair disk permisssions. Drive Genius can see it but not repair and same for Disk Warrior, the 'rebuild' tool is greyed out.
It's a 500GB drive and only has 3GB spare on it, it has loads and loasds of stuff on there, work, music, films, all my preferences, passwords and of course all my software - I do have a backup of some stuff, my photos luckily enough - but I still need to get it fixed.
Now what can I do? Is there anything in terminal I can do? Any other ideas anyone? I'm desperate for help.I have downloaded Data Rescue II and it has been gathering device information for an hour, I'm hoping it will carry on and later on I can start recovering. But in all honestly is there anyway of fixing the drive?And if not can I recover and then do I need to re-format? And if so will it work ok once formatted?Also any ideas why this would have happened?
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Sep 1, 2014
I am trying to check my Harddidk by doing a Verify. So I went to Utilities, select the Harddisk, and then click VERIFY.
Then I the following message pops out: "Disk Utility stopped verifying "Ryan ManUtd" (note: Ryan Utd is the name of my harddisk)
Then it the window panel, there is a message which says: "Error: Live file System repair is not supported"
What does this mean ? Other than that, I can still access the contents in my harddisk ...
Info:
15.4, Mac OS X (10.6.8), 27" iMac - 4GB RAM, 1TB HDD, 1GB ATI Radeon HD, i5 QuadCore
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Apr 2, 2010
i'm trying to format a spare external, it's currently formatted to ms-dos for back up dutys on my PS3 but i want to change it to mac os extended
i've just plugged the drive in ( USB ), nothings running on it, or open on the computer from the drive, but disk utility wont erase it, i've checked permission and everythings fine but it just keeps giving me this error
google and apple fail, only thing i can find linked to it refers to operating systems running on the drive,
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May 12, 2012
In trying to repair my hard drive, which disc utility said was corrupt, it stopped repairing it because it could not unmount the disc?I booted my macbook pro from my backup hard drive.
Info:
macbook pro, Mac OS X (10.6.8)
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Aug 19, 2008
When I try to format my Western Digital "MyBook" external drive, I get an error. It says "could not unmount the disk." What does this mean, and how do I fix it? Also, what's the difference between Mac OS Extended (Journaled) and not journaled?
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Jun 2, 2012
Disk Utility says there are a bunch of disk permissions that need repairing. I hit repair and disk utility says that it repaired those disk permissions. But when I verify, it says they still need to be repaired.
Info:
Mini 2.4Ghz, Mac OS X (10.6.8)
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Feb 12, 2012
I want to erase the hard disk. Holding the Option key when restarting the macbook, and enter the Recovery HD, selecting the Disk Utility. Click the hard disk name, and select Erase tab. Click the Erase button, a message displayed: Disk Erase failed. Disk Erase failed with the error:Couldn't unmount disk.
Info:
MacBook Pro, Mac OS X (10.7.3)
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Apr 14, 2012
My Mac Pro [with 4 internal disks, 2 External Disks (Sata Raid 0), and several external FireWire disks and a Voyager disk station] has a little problem with letting externals go Since a few weeks I have a problem with unmounting my externals. After unmount, the unmounted disk will mount again immediately.No time to disconnect cables and/or power. Hinders disk management, backup, and simple disconnecting disks. It only happens with disks (FireWire 400/800/ SATA and USB alike). USB sticks work fine.
Info:
Mac Pro, Mac OS X (10.7.3)
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Sep 8, 2006
So i put the OSX disk in (10.3) and when i make it boot from the disk the mac logo pops up then it shifts a quarter inch to the right and freezes. I then tried booting it normally and pressed the install button now it boots off the CD automatically with the same result and can't be turned off. Is there an emergency disk remove thing for a powerbook G4? And is there a way to reformat my computer without the disk?
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Apr 4, 2010
I just bought a Seagate Expansion drive, and it has no power button so when it has been plugged in and not in use for a while it unmounts, and then a minute or two later it auto mounts, is there any way to stop it from unmounting and automounting automatically? I would like to control it myself if its possible (id also prefer not to pull the plug each time i want to shut it off).
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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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Jul 5, 2012
Im trying to partition my Macintosh HD and install FCP X on the new partition, because I want to still use my Final Cut Studio when needed. I want to install MAC OS on the new partition so I can use it as a start up disk as well. I followed the instructions as directed.
I restarted my computer and held the command and "R" key. In the disk utility I selected my HD and selected 2 partitions. I named them and entered the size and selected GUID as scheme. but when i hit apply i get " Failed, cant unmount disk" how I can successfully partition my HD.
Info:
Mac Pro, Mac OS X (10.7.3)
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