![]() ![]() the partition could not be unmounted i then unmounted disks 1 at a time. How to Fix the Couldnt Unmount Disk Error on Mac Solution 1: Use a USB Boot Drive to Repair the Hard Drive. In the menu you’ll find access to Disk Utility to prep your drive and then re-install your OS. To unmount a disk in Terminal: Open Terminal in Applications > Utilities or choose Terminal from Utilities in Recovery Mode. Started partitioning on disk0 Unmounting disk Error: -69888: Couldn t unmount. Once you’ve created your boot drive you’ll need to reboot under it. And off you have the older models it will have limited RAM so that also comes to play. Mojave requires Metal2 graphics services which your system does not have. High Sierra intro’ed APFS which only works on SSD’s but using it within a SATA based system is not that great. I do recommend you stick with Sierra Vs any of the newer MacOS’s. Here’s how to do this: How to create a bootable macOS Sierra installer drive So you’ll need to make an external bootable drive and besides that you’ll want to put on it the OS installer so you can appear a fresh copy from it. Think of it this way your shoes heel broke off and your stop by a shoe cobbler how is he going to fix your shoe? You need to take it off right! Thats the same here if you want to reformat the drive you need to boot up under a different drive to release the drive from the OS. When erasing it says “Erase process has failed” with details saying “Couldn’t unmount disk - Operation failed”.Įither make the encryption in FileVault to continue the progress which didn’t work after reading about it and trying things… or to erase the HD and start a new install from my Time Machine backup. ![]() your hard drive from Terminal on your Mac diskutil unmount /Volumes/Time Machine. I tried to repair or erase “Apple HDD HTS547575A9E384 Media” but it does not work. Started erase on disk1 unmounting disk error 69877 couldnt open fter. on Disk Images I see “Apple disk Image Media” which is 2.01 GB and has under it “OS X Base System”(1.29 GB) with option to eject which does not work. In Disk Utilty I see under Internal “Apple HDD HTS547575A9E384 Media” under which is greyed out my “Macintosh HD”. Disk utility tip: Fix couldnt unmount disk errors 1) Once booted from OS X Recovery, select Terminal from the Utilities pull down menu. Now I can not even reformat the HD using Disk Utility from CMD+R mode. I decided to reformat my HD to make a clean install(I have backed up the system with Time machine) after Disk Utility have failed to repair the disk. I think the problem might be something with repartitioning the HD but I see others have problem with encryption as well. After that I went to encrypt my HD using FileVault and it got stuck for days at around 60%. If you used Disk Utility from macOS Recovery, you can now restart your Mac: choose Apple menu > Restart.I am running Macbook Pro (Late 2011) on Sierra osX.įirst I repartitioned my HD into single partition(I had Bootcamp). The order of repair in this example was Macintosh HD - Data, then Macintosh HD, then Container disk4, then APPLE SSD. ![]() Keep moving up the list, running First Aid for each volume on the disk, then each container on the disk, then finally the disk itself.
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