I have an external hard drive, been working perfect as an extra backup. Now all of a sudden I cant see the content in Finder. I can't eject it and it's greyed out in Disk Utility. Any idea what I can do to solve this problem? Don't want to erase the disk unless completely neccessary.

Error when trying to check disk

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    Have you tried the Mountain app? I've used it to mount external drives and also to unmount internal drive. There is an explanation of this app at appgineers.de/mountain. – jmh Jul 22 '18 at 17:40

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