So I opened in recovery mode and ran the first aid and it tried to fix the B-Tree of the catalog file, however there wasn't enough disk space to do this. Use the search bar in the top-left corner to locate files by name or extension.
#Mac os cannot unmount disk how to#
Wait for Disk Drill to complete its scan, then click Review found items. How to dual-boot Linux and Windows on the same hard disk Typically a computer will have a single Boot macOS, Windows, and Linux in UEFI or legacy mode on. Select your external drive from the list then click Search for lost data. (I had about 13GB of free space at this time) Then it tried to restore the disk to it's original state on mount but it couldn't do this either, I'm guessing because of lack of disk space. Launch Disk Drill (Finder > Applications). Sorry I didn't get any screenshots or anything but that is basically what happened.
#Mac os cannot unmount disk mac os x#
Now the disk is greyed out in disk utility and I can't reinstall mac os x because I would need to erase all of the data on the drive and I don't want to lose the files I have on it. So what I thought I could try is delete my BOOTCAMP partition, which is about 100GB, and then merge the free space into the problem partition so that I can run fsck -fy in single user mode to try to repair the volume which now will have enough space to complete the operation. I cannot see or select macOS Base System. To further concern me Macintosh HD is my only option for a startup disk. You can then run Disk Utility from there.n external drive or a network drive is preferred if it is the internal hard drive you have an issue with, since the OS X Recovery is a partition on the same physical drive which may not be able to successfully unmount or modify your internal disk. We can also now see the macOS Base System disk image which is not visible at all in live mode. Now four volumes are Not Mounted - My Data, Preboot, VM, and Recovery. However the option to delete the BOOTCAMP partition is disabled in Disk Utility. Here we see the same disk but this time it is Container disk3. So I did some research and found another post on AskDifferent that explained how to delete a partition from terminal (in recovery mode) by first unmounting the physical disk using diskutil unmountDisk /dev/disk0 and then deleting the partition using gpt remove.
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