In that case, the hard drive may be not connected successfully, or may not get enough power. If your Mac has been used for a long time, the USB port may be bad or dusty. When external hard drive is not working on your Mac, one of the common methods you can try is checking the USB port. So try a different cable in good condition, and check to see if the drive appears. This easy method may do the trick for you.Ī bad cable can cause external hard drive not showing up. If your external drive is not recognized, you can disconnect the drive then plug it again as slow as you can. But in this way, it’s possible the drive could not be recognized. Normally, we plug the drive to the port as soon as we can. You may not have to try them all just work your way down the list until you find the one that works for you.ġ: Plug the external drive as slow as you canĦ: Ensure the drive format is compatible with OS X Try them one by one, then your external hard drive should appear again.

In this post, you can find the most effective methods. Figuring out all methods could take you hours even days.

There are many reasons causing external hard drive not showing up on Mac.

Mac terminal commands external drive