External drive endangered

Hello

have a problem with my WD My Passport for MAC 2 TB external hard drive. I formatted the HARD drive in the MacBook Pro so I own MacOS Sierra.

External WD has 3 partitions (Mac OS Extended journaled).

1. the media (music is)

2 TM (Time Machine backups)

3 CCC (Carbon Copy Cloner backup)

Sometimes some partition is missing in the finder until I have reconnected the hard drive. For example I got all 3 partitions in Finder a few minutes ago, but 1 partition is absent today. Do not understand why... Partition utility disk media shows me gray and it shows the partition is full, but it's not. There are about 50% of free space in the media partition. Yesterday, he shows me on partition CCC.

Any solution please? Not had these problems in El Capitan.

Thank you

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Tags: Mac OS & System Software

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