Otherwise, insert another external storage device in this USB port. Plug the Seagate Backup Plus into another USB port if you have another one. Try using a different USB cable to see if that fixes the problem. If the drive isn't properly plugged in, it will fail to mount as it received not enough or even no power. Check if the cable of the Seagate Backup Plus drive is connected properly to your Mac Thus, once the Seagate Backup Plus drive stops working, you can first do some routine checks as below. Sometimes, the Seagate Backup Plus drive won't mount on Mac is due to the bad USB port or cable. Fix the not mounting or working Seagate Backup Plus drive by reformatting

Repair Seagate Backup Plus drive via First Aid Show the Seagate Backup Plus on the desktop Check if the Seagate Backup Plus drive is mounted in Disk Utility

Check whether the Seagate Backup Plus is showing up in Disk Utility Basic checks like the USB cable, USB port, and power resource. Here are solutions to the Seagate Backup Plus not working or mounting issue. So it's very urgent to fix the problem to make it work again. And you can't access the data stored on it. If you can't mount the Seagate Backup Plus drive in Disk Utility, the hard drive won't work on Mac. 7 solutions to Seagate Backup Plus not mounting/working on Macįor some reason, Seagate external hard drives could not be recognized by Mac. This page will help when Seagate Backup Plus drive doesn't work on Mac. In fact, this issue is very common, especially for those who frequently share the same drive between different computers. I tried this backup disk with a Windows computer and the LED light is working in that case but I am not able to get it to work with my MacBook Pro anymore. My Seagate Backup plus just stopped getting detected (led not working anymore) with my MacBook Pro 2016 model (with USB Type C to USB 3 connector) suddenly.

How to start seagate backup