External hard drive mounting issues on MacOS Sierra

After upgrading to OS Sierra, I found that my USB3 drives, directly connected to my iMac end of 2012, turn off at startup. USB 2 disks are unaffected and connect properly. The only way to access my USB3 disks is to disconnect and reconnect every time I start the computer, then they are ok. I tried to reset the NVRAM, but it did not work. I found Os El Capitan until this issue is resolved.

Do not mount or actually turns out always the system start? It was not clear in your subject line and content later, what was going on.

Are they NTFS formatted drives? See the solutions frequently asked and answered forum if they are.

Tags: Mac OS & System Software

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