- Yeah, Thanks for the advice. Looked yesterday at some benchmarks and Vega to 5700 seems superfluous. I flashed it already to 64 but the bios dumps at techpowerup are a bit old. I couldnt find a working ASRock bios, the one uploaded there is borked - no post after flashing - flashed a powercolor b.
- I am attempting to upgrade from macOS 10.12.6 to 10.13 on a Mac Pro 5,1. I am receiving Unable to Unmount Volume for Repair errors. I have attempted to install this from a USB installer, running the DMG file from the /Applications folder, as well as an alternate disk. All attempts went to the Macintosh HD volume.
- Mac Os X Disk Utility Unable To Unmount Volume For Repair
- Mac Os X Unable To Unmount Volume For Repair Shop
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Disk Utility User Guide
But, when trying to partition, Disk Utility said that it cannot unmount the disk. In Disk Utility, I found another disk called disk2 and Mac OS X Base System. As far as I know, I didn't see that disk2 in my disk list before. I tried to unmount it or erase that disk2, but it won't let me.
Disk Utility can fix certain disk problems—for example, multiple apps quit unexpectedly, a file is corrupted, an external device doesn’t work properly, or your computer won’t start up. Disk Utility can’t detect or repair all problems that a disk may have.
If you run First Aid on a disk, Disk Utility checks the partition maps on the disk and performs some additional checks, and then checks each volume. If you run First Aid on a volume, Disk Utility verifies all the contents of that volume only.
![Mac os x unable to unmount volume for repair parts Mac os x unable to unmount volume for repair parts](https://static01.nyt.com/images/2015/09/03/technology/personaltech/03askk/03askk-superJumbo.jpg)
- In the Disk Utility app on your Mac, choose View > Show All Devices.Note: If you’re checking your startup disk or startup volume, restart your computer in macOS Recovery, select Disk Utility in the macOS Utilities window, then click Continue. If you check your startup volume (Macintosh HD), make sure you also check your data volume (Macintosh HD - Data).
- In the sidebar, select a disk or volume, then click the First Aid button .If Disk Utility tells you the disk is about to fail, back up your data and replace the disk—you can’t repair it. Otherwise, continue to the next step.
- Click Run, then click Continue.If Disk Utility reports that the disk appears to be OK or has been repaired, you’re done. You can click Show Details to see more information about the repairs. Otherwise, you may need to do one of the following.
- If Disk Utility reports “overlapped extent allocation” errors, two or more files occupy the same space on your disk, and at least one of them is likely to be corrupted. You need to check each file in the list of affected files. Most of the files in the list have aliases in a DamagedFiles folder at the top level of your disk.
- If you can replace a file or re-create it, delete it.
- If it contains information you need, open it and examine its data to make sure it hasn’t been corrupted.
- If Disk Utility can’t repair your disk, or you receive a report that the First Aid process failed, try to repair the disk or partition again. If that doesn’t work, back up as much of your data as possible, reformat the disk, reinstall macOS, then restore your backed-up data.
Mac Os X Disk Utility Unable To Unmount Volume For Repair
If your Mac has a Fusion Drive and you see a flashing question mark or alert, see the troubleshooting section of the Apple Support article About Fusion Drive, a storage option for some Mac computers.
If you continue to have problems with your disk or it can’t be repaired, it may be physically damaged and need to be replaced. For information about servicing your Mac, see Find out how to service or repair your Mac.
See alsoErase and reformat a storage device in Disk Utility on MacAdd, delete, or erase APFS volumes in Disk Utility on MacPartition a physical disk in Disk Utility on Mac
I have found myself recently experiencing a couple of Macs which would not allow me to repair the directory or permissions in Disk Utility, or erase/partition the drive with an error such as: ‘Disc erase failed couldn’t unmount disc’ or ‘Disk Erase failed with the error: Couldn’t unmount disk.’
Even trying to use Network Deployment tools such as Apple’s Netinstall service or DeployStudio have also failed to deploy due to these errors.
Normally, any ‘Couldn’t Unmount Disk’ error is attributed to circumstances where the boot drive is being modified or is being used by an application or process. So the first thing to do is to startup the Mac from another bootable drive such as an external drive or OS X Recovery. You can then run Disk Utility from there.
An external drive or a network drive is preferred if it is the internal hard drive you have an issue with, since the OS X Recovery is a partition on the same physical drive which may not be able to successfully unmount or modify your internal disk.
To create your own bootable disk, refer to our blog ‘Creating a Mavericks bootable install disk’.
I would strongly recommend at this stage attempting to back up any data that is required before proceeding with the following steps. Some of the following steps are destructive and will lose ALL data on your drive.
- If you have an external bootable disk, connect this to your Mac and power your Mac up whilst holding down the OPTION/ALT key. Then select the desired external drive from the startup manager screen and press the enter key.
- If you have used our method above to create a bootable installer, choose ‘Disk Utility’ from the available menu. If you have created your own bootable drive with a full system, open Disk Utility from /Applications/Utilities.
- Select the ‘First Aid’ tab and verify the troublesome disk, repairing if needed. Also perform a permissions repair if required.
- Attempt again to perform whichever task caused your ‘Couldn’t Unmount Disk’ error. (For example to Erase/Partition the disk).
Still not playing ball?
You can try booting from OS X Recovery (by holding ‘CMD’ + ‘R’ keys at startup) or an external drive and use the command line to attempt to unmount or erase the disk:
1) Once booted from OS X Recovery, select Terminal from the Utilities pull down menu. (Or if you are booting to your own bootable drive with a full system, open Disk Utility from /Applications/Utilities).
At the unix prompt enter:
Press RETURN. From the listing, look in the Identifier column for your disk identifier. It will look like ‘diskx’ where ‘x’ is an integer starting at 0. You should also see the name of the disk such as ‘Macintosh HD’. In my example below, the disk name is ‘Server’. Lisanne froon and kris kremers google map. Note down the disk identifier. For a single drive system this will probably be ‘disk0’ :
2) Now enter the following where ‘x’ is your disk identifier:
3) Press RETURN. Enter your admin password if prompted. This should unmount all volumes of the physical drive:
4) Attempt again to perform whichever task caused your ‘Couldn’t Unmount Disk’ error. (For example to Erase/Partition the disk).
Still unable to work on the disk? Still getting those pesky disk errors?
Bit more drastic, but you can attempt to force a volume or the entire physical disk to unmount:
FOR A VOLUME:
1) Using the Terminal application again, booting from OS X Recovery or an external bootable drive,
Enter the following where ‘x’ is your disk identifier and ‘y’ is your volume identifier, (remember to use the ‘diskutil list’ command if you need to find out your disk and volume identifiers):
2) Press RETURN. Enter your admin password if prompted. This should force unmount the volume:
3) Attempt again to perform whichever task caused your ‘Couldn’t Unmount Disk’ error. (For example to Erase/Partition the disk).
FOR AN ENTIRE PHYSICAL DISK:
1) Using the Terminal application again, booting from OS X Recovery or an external bootable drive.
Enter the following where ‘x’ is your disk identifier. The longest day colorized download. (Remember to use the ‘diskutil list’ command if you need to find out your disk identifiers):
2) Press RETURN. Enter your admin password if prompted. This should force unmount the entire physical disk and all its related volumes:
3) Attempt again to perform whichever task caused your ‘Couldn’t Unmount Disk’ error. (For example to Erase/Partition the disk).
OK, we’ve tried to be nice, but is the disk STILL not letting you work with it?
Be sure you backup your files to an external drive or second internal drive, the following procedure will remove everything from the hard drive!
Mac Os X Unable To Unmount Volume For Repair Shop
![Unable Unable](https://i.imgur.com/DxIqDT2.jpg)
We are now going to force erase the physical disk, creating a single Mac OS Extended (Journaled) volume. This should then allow you to partition and work with the physical disk again.
1) Using the Terminal application again, booting from OS X Recovery or an external bootable drive.
Enter the following where ‘MacintoshHD’ is the name of the newly created Mac formatted partition, and where ‘x’ is your disk identifier, (remember to use the ‘diskutil list’ command if you need to find out your disk identifiers):
Enter the following where ‘MacintoshHD’ is the name of the newly created Mac formatted partition, and where ‘x’ is your disk identifier, (remember to use the ‘diskutil list’ command if you need to find out your disk identifiers):
2) Press RETURN. Enter your admin password if prompted. This should force erase the entire physical disk and all its related volumes, then create a single Mac OS Extended (Journaled) volume:
3) Hopefully you can now perform your desired erase, partition, installation or deployment on this drive.
NOTE: Use of the ‘sudo’ command may not be necessary for some of these actions, however, as long as you know the administrator account’s password, starting any unix command with ‘sudo’ will force the command to be run as the unix root user, so you shouldn’t have any permission issues executing the command.
Disclaimer:
While the author has taken care to provide our readers with accurate information, please use your discretion before acting upon information based on the blog post. Amsys will not compensate you in any way whatsoever if you ever happen to suffer a loss/inconvenience/damage because of/while making use of information in this blog.
Mac Os X Unable To Unmount Volume For Repair 69673
This feature has been tested using OS X v10.9.2 which was the latest Mac OS release at the time of writing.