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USB Drive doesn't automatically mount when connected to MacBook Pro 10.11.6, but can be mounted using Disk Utility

User's USB external drive does not automatically mount when connected to a MacBook Pro
When I run Disk Utility, I am able to get the drive to mount after I run disk repair, and then automatically mount.
Disk Utility shows that the drive is in the unmounted state after being connected to the MacBook Pro

What could be preventing the mounting?
Is a Mac OS upgrade required?
Is the drive damaged?
Are the Mac's USB ports a problem?

User has a MacBook Pro with Mac OS X 10.11.6
MacBook Pro Retina 2.2GHz Intel i7  - Mid 2014

Backup drive is Seagate Ultra Slim PL Media
1 TB, USB connection
Partition Map is Master Boot Record

Time Machine accepted this MBR drive as a backup drive
Would MBR partition keep the drive from being mounted?
Apple HardwareMac OS XStorage HardwareHardware

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Last Comment
Owen Rubin

8/22/2022 - Mon