When I connect an external hard drive to macbook pro it is very slow to appear on the desktop and Finder window, sometimes 20 mins or more, even with auto backup switched off . any clues?

when I connect an external hard drive to macbook pro it is very slow to appear on the desktop and Finder window, sometimes 20 mins or more, even with auto backup switched off . any clues?

Hi robfromkinglake west,
Try and isolate the issue.  Check if it's only with this drive.
Check the drive with Disk Utility
Using Disk Utility to verify or repair disks
I've never seen a drive take 20 minutes to mount.

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