Undetected external seagate HD after the Sierra of OS upgrade.

MacBook Pro (13-inch, mid-2012)

Processor: Intel Core i5 2.5 GHz

Memory: 4 GB 1600 MHz DDR3

Graphics card: Intel HD Graphics 4000 1536 MB

Operating system: macOS Sierra

Problem: Just upgraded to OS sierra and my external seagate to will not appear on my mac. All my stuff is there.

But after I plug it into a windows computer, appears and works very well, so it still don't know what is the issue.

Troubleshooting steps already taken: Finder + external audit HD preferences

Please suggest a solution!

Hi there, Arindamdeb3000!

Thank you for joining the communities Support from Apple! It seems that you are having problems with your external hard drive since your update for Sierra. I know how it is important to be sure that it is recognized by your computer at any time. First of all, try using a different cable and another USB port to see if there is a difference.

What you might want to try next some specific reboots. Read this article for trying safe mode if your Mac does not end commissioning. Although this article is about the computer does not start correctly, it can also perform repairs and stop startup items that can cause problems.

Then, check out this article with steps how to reset controller (SMC) system on your Mac.

See you soon!

Tags: Mac OS & System Software

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