External HDD appears in terminal but can't be mounted or unmounted

Thank you for the thoughts.

Drive does not show in Disk Utility which just hangs up on "Loading disks" and shows nothing further.

Within terminal, diskutil list results in....

/dev/disk2 (external, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *2.0 TB disk2

1: EFI EFI 209.7 MB disk2s1

2: Apple_HFS LaptopBkp & Movies 2.0 TB disk2s2

Here's what I have tried with the format, my try --> result

diskutil unmountDisk /dev/disk2 --> Unmount of disk2 failed: at least one volume could not be unmounted

diskutil eject /dev/disk2 --> Volume timed out while waiting to eject

diskutil unmountDisk /dev/disk2s2 --> Unmount of disk2 failed: at least one volume could not be unmounted

diskutil mountDisk /dev/disk2s2 --> One or more volume(s) failed to mount

diskutil eject /dev/disk2s2 --> Volume timed out while waiting to eject

diskutil eraseDisk JHFS+ newdisk /dev/disk2 -->

Started erase on disk2

Unmounting disk

Error: -69888: Couldn't unmount disk

diskutil verifyDisk /dev/disk2 -->

Started partition map verification on disk2

Checking prerequisites

Checking the partition list

Checking the partition map size

Checking for an EFI system partition

Checking the EFI system partition's size

Checking the EFI system partition's file system

Checking the EFI system partition's folder content

Problems were found with the partition map which might prevent booting

Error: -69854: A disk with a mount point is required

This leads me to believe I need to repair the partition map. I have tried to search for articles related to this issue, but nothing seems like the right situation.

As you may have guessed, I'm not concerned about losing the data (it's one of 2 backup disks) but would like to be able to continue to use the drive.

Thank you for your help.