Jun 14, 2013 Such boot drives are easy to create on your own, here are instructions for making boot disks for OS X 10.9, OS X 10.8, and OS X 10.7. For older Macs running prior versions of Mac OS X, typically anything running OS X 10.6 or earlier will have a SuperDrive, and thus shipped with a bootable DVD that can serve this same purpose. When an external hard drive is not working properly, you can use the built-in disk repair tool - First Aid to check and repair disk errors. Step 1: Launch Disk Utility. Step 2: Choose the unmountable external drive on the left sidebar. Step 3: Select First Aid in the top center and click Run. Solution 2: Repair the external hard drive with Terminal. Mac OS X Support Mac Software Other Apple Hardware. Tried it and still the same unable to unmount volume for repair. RehabMan Moderator. Joined May 3, 2012. 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. Jan 17, 2018 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.
Disk Utility User Guide
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.
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
Hello -
Mac Os X Disk Utility Unable To Unmount Volume For Repair
I've successfully installed the High Sierra GM candidate on my MacBook Pro.
I've spent the past few hours trying to get it to install onto my Mac Mini (Late 2014). Currently running Sierra.
When I run the installer, it reboots, starts to install, then says 'Unable to unmount volume for repair'.
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).
Mac Os X Unable To Unmount Volume For Repair Parts
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.
![]() Mac Os X Unable To Unmount Volume For Repair Service
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).
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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.
Mac Os X Unable To Unmount Volume For Repair 69673
If I run 'diskutil mount ...', then immediately try 'diskutil unmount' (without 'force'), it fails with the same 'dissented by PID=0 (kernel)' error.
Mac Os X Unable To Unmount Volume For Repair ShopMac Os X Unable To Unmount Volume For Repair Iphone
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.
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