First Aid Process Failed on External Hard Drive: Internal Error (-69610)
Background: https://discussions.apple.com/thread/251328034?page=1
I finally managed to get rid of the Zero KB * partition formatted as "Uninitialized," by formatting the entire drive to APFS and then back to Mac OS Extended (Journaled). I finally have only one 3TB partition labeled "Untitled." My woes did not end here, however.
As I tried to partition the drive into (1) a 2TB partition for Time Machine and (2) a 1TB partition for specific files backup, I get this error: Couldn’t modify partition map because file system verification failed. Please verify and repair each volume individually and then try again. : (-69803) Operation failed...
When I try to make three partitions so that I can manually delete the "Untitled," partition by reducing its size (since I can't just (-) this partition once it is selected), the horrible Zero KB * Uninitialized partition reappears in its place. This time, though, I can delete the Uninitialized partition, but the same error (Couldn’t modify partition map because file system verification failed. Please verify and repair each volume individually and then try again. : (-69803) Operation failed...) shows.
I am left with one 3TB partition labeled "Untitled."
When I run First Aid on the disk as a whole, the operation is successful. However, when I run First Aid on the "Untitled," partition, I get this error: An internal error has occurred. : (-69610) Operation failed...
What's most curious about this is that even though I get an error at the end, First Aid tells me that, "File system check exit code is 0."
I want to run First Aid successfully on all partitions and for Disk Utility to let me make the two partitions mentioned above, without having the dreadful "Uninitialized," partition reappear. What must I do for this external hard drive to start cooperating with me again?
MacBook Pro 13", macOS 10.15