External Drive Files Not Showing Up on Mac but files do shows Up on PC

External Drive Files Not Showing Up on Mac but files do shows Up on PC
i had the Ex HD for about 3 years running smoothly on my mac but recently everything disappeared. plunged it into a pc to see if it read my files and it did. what can i do? to make it work on mac again. i don't want to reformat that drive because i have important applications (DMG) and other zip photo video files in the drive.

yes. i did.
...i have tried "verify" & "repair" but they didn't pass the san test. and when i "unmounted/mount" a error message popped up say that there is a application running off the drive but there nothing (i see) running, to close all activity

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