1. Macos High Sierra Unable To Unmount Volume For Repair 69673
2. Macos High Sierra Unable To Unmount Volume For Repair Iphone
3. Macos High Sierra Unable To Unmount Volume For Repair Youtube

Hello -

I have a 21.5 iMac late 2013 that boots from an external SSD. Had no issues installing Sierra but now when I try to install High Sierra it gives the following error: “MacOS could not be installed on your computer. Unable to unmount volume for repair”.

I've successfully installed the High Sierra GM candidate on my MacBook Pro.

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• Sep 25, 2017  macOS High Sierra GM candidate install fail Unable to unmount volume for repair 7389 Views 8 Replies. Latest reply on Sep 25, 2017 8:19 PM by KMT. Level 1 (0 points) paulbart1234 Sep 14, 2017 10:50 PM Hello - I've successfully installed the High Sierra GM candidate on my MacBook Pro.
• Dec 08, 2019 The combination you choose will determine which version of macOS will be installed on your system when you select Reinstall macOS. Get an iPhone SE with Mint Mobile service for $30/mo Press Command - R to install the latest version of macOS that was installed on your Mac without installing a later version.

I've spent the past few hours trying to get it to install onto my Mac Mini (Late 2014). Currently running Sierra.

Sophos antivirus for os x download. When I run the installer, it reboots, starts to install, then says 'Unable to unmount volume for repair'.

Mac os x versions. If I boot into Recovery, then run disk utility, I get a similar error. If I bring up a terminal, then 'diskutil unmount' the drive, it says 'Volume Macintosh HD on diskX failed to unmount: dissented by PID=0 (kernel)'. This is from the Recovery partition, so I'm not actively booted from 'Macintosh HD'.

I ran 'diskutil unmount force' on the partition, then I was able to run Disk Utility's 'First Aid'. Everything seemed OK. I still couldn't install High Sierra (same error).

I then created a High Sierra installer on an SD card, and booted from it (held Option while booting). Again, when installing macOS, I get the 'Unable to unmount the volume for repair' error.

If (while booted from the SD card) I bring up a terminal and 'diskutil unmount force', the installer doesn't show 'Macintosh HD' as an option (expected).

If I run 'diskutil mount readOnly ..', then run the installer, it sees the disk - but fails (because it's readonly). When it's mounted readonly, 'diskutil unmount' (without force) works fine.

If I run 'diskutil mount ..', then immediately try 'diskutil unmount' (without 'force'), it fails with the same 'dissented by PID=0 (kernel)' error.

Why is the kernel mounting 'Macintosh HD' (even when I'm booted from external media) and keeping it 'locked'? Is there any way to fix this?

I've also tried 'csrutil disable' to disable the System Integrety protection stuff. No difference.

Any ideas/suggestions?

Thanks!

- Paul B.

One of the old Mac OS X utilities, Disk Utility, has received a makeover in macOS Sierra. The updated app now presents a streamlined appearance while retaining all of its former functionality, and it’s still useful for verifying or repairing disks. This can be useful if you’re running into odd issues with a Mac, so we’ll take a look at the process of verifying and repairing disks with macOS Sierra’s Disk Utility.

Some of the issues you might encounter that indicate a disk that might need repair:

• Multiple apps quit unexpectedly
• A file is corrupted
• An external device doesn’t work properly
• Your Mac refuses to start up

Verifying Disks
Verifying a disk subjects it to a series of checks, all of which are done through a process called “Live Verification”. This means that Disk Utility can check the status of a disk, its catalog file, multi-linked files, catalog hierarchy and more the Mac needing to be started up with another disk drive. It does this by “freezing” the volume, so while you’re running the verification tests you may find that your Mac becomes slow or unresponsive.

Macos High Sierra Unable To Unmount Volume For Repair 69673

To verify a disk, simply launch Disk Utility (found in Applications > Utilities), click on the drive volume you wish to check, then click on the First Aid button in the Disk Utility toolbar. Disk Utility responds by stating what it’s about to do:

Click the blue Run button to begin the process of verifying the disk. Disk Utility informs you of what’s about to happen, specifically noting that apps will become unresponsive during the tests.

Click the blue Continue button, and Disk Utility begins to perform its battery of tests on the hard drive. The process usually runs quickly, taking only a few minutes to verify a large (2 TB) boot drive. You’ll get a notification that the First Aid process is complete (see image below), with either a green check mark indicating that everything appears to be OK or a red X indicating that there are some issues that need to be repaired. To repair a disk, it’s necessary to boot from another drive, then run Disk Utility again. We’ll cover that in the next section of this post.

Note that the Live Verification process only works on volumes that have been formatted as “Mac OS Extended (Journaled)”. If you run First Aid on a volume that is not journaled, Disk Utility responds with an error message saying “ERROR: could not freeze volume (Operation not supported). In addition, you may not be able to interrupt the Live Verification through First Aid, so it’s best to let it continue to run until completed. Finally, an alert message that says “Incorrect size for file temp” is no cause for alarm.

Repairing a Disk
If First Aid and the Live Verification process indicate that repairs are required on a volume, it’s time to boot from another disk drive and then run Disk Utility again. Fortunately for Mac users, there’s a built-in “boot disk” in the guise of the Recovery Partition.

To boot from the Recovery Partition, restart your Mac and hold down the Option key. When the Mac restarts, you are greeted by icons for all of the available drives. In the example below, there’s a Sierra drive, a Windows drive (Boot Camp), and a drive designated “Recovery-10.12”. macOS Sierra is also known as macOS 10.12, so this is the Recovery Partition for our Sierra boot drive.

Use your mouse, trackpad, or keyboard arrow keys to highlight the “Recovery-10.12” drive, then press Return. Once the system has booted, four macOS Utilities are listed, one of which is Disk Utility (see image below). Click Disk Utility to select it, then click the Continue button. The familiar Disk Utility window appears. Click on the drive requiring repairs, then click First Aid again. As before, Disk Utility will take the volume through the Live Verification process. When it finds errors on that volume, it can now repair them since you’ve booted from another disk.

Should you require additional detail not found in this post, be sure to check these two Apple knowledge base articles:

• Disk Utility for Mac: Verify a disk using Disk Utility
• Disk Utility for Mac: Repair a disk using Disk Utility

Macos High Sierra Unable To Unmount Volume For Repair Iphone

Further reading on macOS Sierra:

• How To Get Ready For macOS Sierra
• Create a Bootable macOS Sierra Install Drive with DiskMaker X
• macOS Sierra Preview: Using Siri on the Mac

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Macos High Sierra Unable To Unmount Volume For Repair Youtube