Why I can't see my files on my external hard drive on my Mac?

I got my mac less than a year.

I have an external hard drive (external hard drive, Silicon Power A80 - 2 to Armor) and I use it on my MacBook Pro and my PC.

Today I just plugged into my mac, and suddenly I saw this error. Should I really reformat because I have so many files it.

Please help me fix.

Thank you.

MacBook Pro (retina, 15 inch, mid-2014), OS X EL Capitan, Beta Version 10.11.

When you reformat you will delete also, that OK with you, or you want to keep the files stored there.

Tags: Notebooks

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