![First aid high sierra volume could not be unmounted](https://cdn1.cdnme.se/5447227/9-3/screenshot_8_64e62948e087c31b4a9aa5ed.jpg)
Is it the Fusion drive that's causing the problem? My understanding is you can install High Sierra on a Fusion drive just fine and the installer will leave HFS+ alone on the drive and not force an upgrade to APFS.
![first aid high sierra volume could not be unmounted first aid high sierra volume could not be unmounted](https://images-na.ssl-images-amazon.com/images/I/51QXtyPYCIL._SX331_BO1,204,203,200_.jpg)
I'm kind of at a loss for how to continue here. However, once the installation reboots the computer I get the same warning. This drive successfully boots to the recovery screen and from there I can select an upgrade option.
![first aid high sierra volume could not be unmounted first aid high sierra volume could not be unmounted](https://img1.wsimg.com/isteam/ip/04433131-cbb7-4d56-8eab-043900564722/20200712_031848.jpg)
I did an install to an empty FW drive I have on hand and was able to complete the clean install and boot from that drive just fine.Įvery time I try to upgrade the 10.12.6 install on my Macintosh HD drive I get: I've downloaded the High Sierra installer from the App Store and can confirm it's good and works.
![first aid high sierra volume could not be unmounted first aid high sierra volume could not be unmounted](https://i1.wp.com/swissmacuser.ch/wp-content/uploads/2017/07/macOS-High-Sierra-Beta-APSF-issue-with-external-bootable-SSD-05-Running-bless-failed.jpg)
3.11 TB fusion drive for main drive labeled Macintosh HD in my system.I'm stuck in an upgrade loop for High Sierra.
![First aid high sierra volume could not be unmounted](https://cdn1.cdnme.se/5447227/9-3/screenshot_8_64e62948e087c31b4a9aa5ed.jpg)