When I try to repair my external storage disk using Disk Utility I get the following message:

Repairing the EFI system partition’s file system
Updating boot support partitions for the volume as required.
Creating a new EFI system partition
Problems were encountered during repair of the partition map:
Error: Couldn’t repair the partition map because a new EFI system partition couldn’t be created.

My question is why am I getting this error message on an external drive?

This is an 1TB external storage disk that I use only to store Time Machine backup files, and other data.

As far as I remember, this hard drive was never bootable.

This hard drive worked fine until recently.

Any help will be greatly appreciated.

Askify Moderator Edited question April 16, 2023