Difficulty finding a WD external hard drive after update to 10.11.4

Hello
last week I updated my OS to El Capitan 10.11.4.
After that, I have problems, make a backup on my external drive (Wester Digital MY Passport Ultra).
After reset total of my iMac, the backup runs once, but the hourly automated backup stops.
A manual start is not successful.

The external hard drive is visible in the finder, but clicking the map Backups.backupdb, nothing happens. After a reboot all backups are still visible.
It seems that the external hard drive is dismantled after the initial backup.

Time Machine is running, HD connected properly.
Latest version of the WD software is installed.

Does anyone know the solution for this problem.

Hi wots36,

Thank you for using communities Support from Apple! I'm sorry to hear you're having these problems with your iMac and your external hard drive. If you continue to have problems with your Time Machine backups, you can find information and troubleshooting procedures described in the following articles useful:

If you cannot back up or restore your Mac with Time Machine - Apple Support

OS X El Capitan: If Time Machine can't find your backup disk

Concerning

Tags: Mac

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