Force Mount External Hard Drive Ext HD

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In terminal, I entered 1 diskutil list [enter]

2 diskutil verifyDisk disk3 [enter]

This forced the disk to mount. It was not even accessible to disk aid before... Phew... Done!

Now transferring all my data to a more reliable drive. Oh, dear. Thank you!!! After that, I will format the drive to a mac friendly format - not compatible formats....

To explore all the functions of diskutil, in terminal type

man diskutil