Mac won't open my external HD

Hi,
I have an external Hard-Drive and I have always used it in my macbook. The HD has 2 partitions (Fat and exFat). When I open Disk Utility appears the name of the partitions but in grey letters. What should I do?
PS.: I`m using OS X Yosemite

Mount and/or repair them.
(110589)

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Charles Deister
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Mac won't open my external HD

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