OS X Mavericks :: Repartition From Recovery Disk / Cannot Unmount Disk

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." 

iMac, OS X Mavericks (10.9.4)

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OS X Mavericks :: MacBook Pro Only Turns On In Recovery - Disk Utility Can't Repair Disk

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? 

MacBook Pro, OS X Mavericks (10.9.4)

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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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Intel Mac :: Erase Disk Shows Couldn't Unmount Disk

Jun 18, 2012

Installing Imac back to factory settings, erase disk shows could't unmount disk how to solve

MacBook Pro, Mac OS X (10.7.4), I bought a usb stick with the OS Xa

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OS X :: Disk Utility Error / Disk Could Not Unmount

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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OS X Mavericks :: Locked Out Of Recovery HD Disk Drive?

Jun 21, 2014

Locked out of my recovery HD disk drive what do I do?

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OS X Mavericks :: IMac 10.9 Recovery Disk Will Not Start?

Jun 1, 2014

I am having boot up problems on my imac 27-inch. I pressed the power button and press and held the Option key, I chose the Recovery disk, but the Recovery disk did not start, instead I have the grey Apple logo and it keeps running but will not start. 

The imac 27-inch was bought refurbished in late 2010. I also have imac apple care from 2010 never used. First time problem. On pressing the Option key during startup, Mach Hard disk and Recovery Disk 10.9 is displayed.

Choosing mac hard disk does not boot up the OS instead I get a big Zero sign with line through it or a big flash question mark sign. Choosing the Recovery Disk 10.9 does not boot up Disk Utility, instead I get the grey Apple logo.

iMac, OS X Mavericks (10.9), mac hard disk and Recovery 10.9disk

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OS X Mavericks :: How To Create Space On Recovery Disk To Reboot IMac

Dec 11, 2014

My iMac has the grey screen upon turning on.  When I attempt to restore OS X mavericks, there is not enough space on the recovery drive.

When I try to erase the disk, the error message says it is unable to erase.

iMac (27-inch Late 2009)

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OS X V10.7 Lion :: Can't Partition Disk- "Error Cant Unmount Disk"

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.

Mac Pro, Mac OS X (10.7.3)

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Power Mac G5 :: Finding Start Up Disk Or Recovery Disk

Oct 6, 2007

with my G5 I need to get a new hard drive since the old one died. to format the new hard drive do I need a start up disk or a recovery disk.

PowerMac G5
Mac OS X (10.4.10)
Dual Core 2.0 2x 256 Ram

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MacBook :: Uograde Hard Disk Without Recovery Disk

Apr 10, 2009

Next year when snow leopard will be released I was thinking to upgrade my poor 60gb hard disk to something more probably to a 320 one, but I got one problem I lost my recovery disk and actually I don't really need it as you know Tiger is very stable.

When my old macbook will have inside the new hard disk do I need to reinstall tiger then upgrade it to snow leopard or I can directly install snow leopard?

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OS X :: Formatting External HD - Could Not Unmount Disk

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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MacBook Pro :: Error - Couldn't Unmount Disk

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.

MacBook Pro, Mac OS X (10.7.3)

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Mac Pro :: External Hard Disk Mounts Again After Unmount?

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.

Mac Pro, Mac OS X (10.7.3)

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Software :: Stop Disk From Unmount / Mount Automatically?

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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MacBook Pro :: Erase/Unmount Disk - Dock Utility?

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.

MacBook Pro

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Hardware :: Unable To Reapair External Disk / Unmount Error

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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MacBook Pro :: Erase Corrupted SSD Internal Drive - Can't Unmount Disk

Dec 6, 2014

I'm trying to erase my SSD internal drive that is corrupted software (Yosemite).I'm booting from an external with 20GB Yosemite OS & 480GB that contains files I've dragged off the internal SSD.I'm getting the error:Volume Erase failed with the error:Couldn’t unmount disk.How can I get around this?

MacBook Pro, OS X Yosemite (10.10), 13"

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PowerPC :: Hard Drive Not Working / Repair Volume Failed Could Not Unmount Disk

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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OS X Mavericks :: Utility Disk - Check Disk Not Working?

Jun 29, 2014

I have a MacBook Pro running Mavericks. 

Recently I noticed that if I run Check Disk in Disk Utility, all the process works correctly but at the end it doesn't tell me that everything is correct (in green).

On the contrary, if I run it in recovery mode, (reboot w cmd-r), it works correctly to the end with the correct green result at the end. 

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OS X V10.6 Snow Leopard :: Time Machine "could Not Unmount Disk"

Jul 1, 2012

I have a Buffalo Ministation 1T (as my portable hardrive), been using it for about 3 months and works perfect, nothing wrong with it at all and time machine formatted it straight away. I recently got the Samsung G3 Station 2T (as a back up to the buffalo) and Time machine says "There was an error erasing the Time Machine backup disk SAMSUN. Could Not Unmount Disk". Then in disk utility when i click erase from (MS - DOS (FAT) To (Mac OS Extended (Journaled)) it says "Volume Erase failed with the error: Could Not Unmount Disk".

Info:MacBookPro, Mac OS X (10.6.8)

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Intel Mac :: Erase Hard Drive Mac OS X (LION) "Couldn't Unmount Disk"

Apr 15, 2012

I've just transferred my data to a new computer and now need to erase the hard drive on my old one.. I've tried Disk Utility, increased the security, and tried 'erase' but I keep getting an error message "couldn't unmount disk". I've gone into Partitions and tried deleting the HD there as well but I get the same message. I just want to get the computer securely wiped and would like to keep Lion as the operating system. 

Macbook 2GB ram, Mac OS X (10.4.9)

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OS X :: How To Use Disk Utility For Data Recovery

Feb 15, 2010

i have a hard drive i use mostly in Windows that i lost data and want to recover it. i've played with some of the free utilities on the internet but they either take too long or aren't very good.

since Tiger reads NTFS partitions i was going to try it on my Mac Mini.

i usually use a laptop and don't have time to leave the recover running for 10 hours or more. any good free utilities out there?

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MacBook Pro :: How To Obtain A Recovery Disk

Apr 9, 2012

How do I obtain a recovery disk for my Macbook Pro?  None was supplied when bought

MacBook Pro, Mac OS X (10.7.3)

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OS X V10.7 Lion :: Create A Dvd/cd Recovery Disk Instead Usb?

May 5, 2012

How i can create a dvd/cd recovery disk instead usb?

MacBook Pro, Mac OS X (10.7.3)

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OS X V10.7 Lion :: Is Recovery Disk Also Updated To 10.7.4

May 11, 2012

I would be interested to know if updating, for example, Lion 10.7.2 to 10.7.3, or 10.7.3 to 10.7.4, also updates the System on the Lion Recovery Disk. 

I thought I could find out by booting on the Recovery Disk, but there's no "About this Mac" item in this System's Apple menu. 

iMac, Mac OS X (10.7.4), Core i7, SSD, 12 GB Ram.

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OS X V10.7 Lion :: Recovery Disk Assistant Won't Run?

Jun 22, 2012

I have a MBP mid-2010, originally with Snow Leopard, but long since running Lion (currently the latest release, 10.7.4). When I installed Lion, I created a recovery partition on the MBP's boot disk. This was about 9 months ago. I now want to run Recovery Disk Assistant to create a recovery partition on an external disk, but when I start Recovery Disk Assistant it says: "Lion recovery could not be created"... because the recovery HD on this computer is damaged or not present...etc. 

However, if I open a Terminal and run "Diskutil list", I see: 


So, the recovery partition appears to be there. I presume Recovery Disk Assistant thinks it's damanged. However, I can hold down Alt/Option when booting my MBP and I see the recovery partition. I can even boot from the recovery partition and everything works as expected. 

MacBook Pro, mid-2010 MBP running Mac OS 10.7.4

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PowerPC :: How To Get A Recovery Disk For Apple Ibook G4

Jul 1, 2008

I just got an apple ibook g4 from a pawn shop. But it did not come with a recovery disk. The master password is still on there and I don't know it. What should I do? Who ever had it before me did not clear everything off of it.

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OS X :: Hard Disk Drive Data Recovery

Jul 18, 2009

first off, long time MacRumors reader, finally joined the forum now in search of some aid.There are some other threads on a similar topic I know, but I was hoping for some So, the Hard drive in question is a Western Digital 5400rpm 320gig purchased from Amazon about 8 months ago, now the Hard drive has decided to die. I saw some early signs, but did not realise that the drive was in that bad of a condition at the time. Now, when attempting to boot into Mac OS X I get stuck at the Apple logo, with the little wheel spinning infinitely. I had a boot camp partition which worked, but could not help me and is no longer an option either. I tried using the Leopard boot disk, but Disk utility didnt do anything for me in terms of recovery or repair, I attempted to use the terminal to make an Image of the drive on an external, but it fails about 10% through, I'm assuming from corrupted data.

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OS X V10.7 Lion :: Recovery Disk Partition Is Missing

Feb 7, 2012

I installed a new hard drive to expand my disk size for a late 2009 MacBook Pro 15". I used time machine to "clone" the machine to the new drive. However, I noticed while trying to set up Boot Camp that I no longer have a Recovery Disk partition with Lion. How can I set this feature back up on my new hard drive?

MacPro, Mac OS X (10.6.5), MacBook Pro 10.6.5

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