![]() ![]() This significantly limits your abilities, so we will describe the best ways to fix that error message in this article. It is sad that the other MacBookPro is working just fine. June 9th, 2022 Summary: Getting a message couldn’t unmount disk means that you won’t be able to erase, partition, reformat or do any other actions with the drive. This has made using these external drives very complex as I must go into terminal and manually mount them. I have run first aid from Disk Utility (and in the recovery console) and it always says things are just fine. Click on the Erase button function on the top of the Disk Utility window. Click the icon of your unmountable external hard drive on the left sidebar. Tutorial to reformat unmountable external hard drives on Mac. It may be that the existence of those directories in /Volumes is the problem. And then, you can reformat it to fix external hard drive is not mounting on Mac. Unfortunately, MacOS has changes a lot from when I did lower level work on it so I don't know where the data may be about the automounting and existing volumes.įinally, I can not seem to delete the /Volumes/Andromeda and two other mountpoints even after rebooting, rebooting into safe mode, and rebooting into the recovery console. The exact same drives mount perfectly fine on another MacBookPro running the same version of the MacOS (11.2.3)Īs best as I can tell, the OS has corrupted itself somewhere with respect to the mount volumes. ![]() That drive also has multiple partitions on it.įinally, I tried reformatting one of the drives (it was a backup) and named it the same as the prior volume and it would not mount, even with a full reformat. This has now spread to a second drive that was working just fine for well over a year of temporary mounting and unmounting. The other thing is that the directory in /Volumes continues to remain to be there for the drive/volume. Everything seems fine until I unmount it (via Disk Utility or Finder) and I can then no longer mount it again. However, if I use the terminal via "sudo diskutil mount -mountPoint /tmp/Andromeda /dev/disk2s1" it does work and everything sees the volume. In the box labeled Get Info, locate the Sharing & Permissions section and click on it. To do this, follow these steps: On the desktop, locate the icon representing the drive, right-click it, and pick the Get Info option. ![]() Specifically, the error "Could not mount “Andromeda”. I recommend you first check and configure the drive’s permissions. But I always get an error when trying to mount it via the Disk Utility GUI. MacOS USB drive no longer auto-mounts So, I have a USB drive I have used for years and it suddenly does not mount anymore. ![]()
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