Can not mount, erase, or run First Aid on external Time Machine hard drive.
Time Machine partition on my 3TB external hard drive won't mount, First Aid fails, and I can't even erase it and start over. What can I do? The other partition (just files and such) is working fine.
If I run First Aid, I get:
Running First Aid on “Time Machine” (disk2s2)
Repairing file system.
Volume is already unmounted.
Performing fsck_hfs -fy -x /dev/rdisk2s2
File system check exit code is 8.
Restoring the original state found as unmounted.
File system verify or repair failed. : (-69845)
Operation failed…
If I try to erase it, I get:
Couldn’t open disk. : (-69879)
Operation failed…
I'd love to just be able to erase it and start a new Time Machine disk on the partition, but I can't even do that. If anyone can help me out, I'd be extremely grateful.
MacBook Pro 15", macOS 10.15