If the external hard drive is greyed out in Disk Utility, it's not mounted. Fortunately, it's easy to fix these issues. If the Seagate Backup Plus is mounted in Disk Utility, you should blame the wrong computer settings or an outdated computer. Check if the Seagate Backup Plus drive is mounted in Disk Utility Otherwise, you can move to the next solution. In that case, you should send the drive to the local repair shop. If you can't see the external hard drive in macOS, the drive probably has been physically damaged. Launch Disk Utility and check the left pane then. Open the Utilities folder in your Applications folder. To troubleshoot this problem, you first need to know if this Seagate hard drive is detected by your Mac. Check whether the Seagate Backup Plus is showing up in Disk Utility To fix the problem, you can plug the Seagate Backup Plus into a PC and then access the drive on Windows. Your Mac computer is not able to mount it. Check if the format of the Seagate hard drive is supported by macOSįor example, a Windows BitLocker encrypted drive will not be working on Mac originally. What you should do is ask for help from Apple support. If the drive works on another Mac computer, there is something wrong with your Mac computer rather than the drive. And for Seagate Backup Plus Hub and Expansion Desktop, a power adaptor is required for the power supply.Ĭonnect the Seagate Backup Plus drive to another Mac computer to see whether it works on that one or not. In this situation, you can try to connect the Seagate Backup Plus with a USB Y cable if you have one. But sometimes this amount of current may be insufficient while the drive is spinning up. In general, the current USB ports 2.3 and 3.0 are enough for most external portable hard drives. Check whether the Seagate Backup Plus external hard drive is powered properly Otherwise, insert another external storage device into 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 external hard drive that's not mounting on Mac is due to a bad USB port or cable. FAQs about Seagate external hard drive not mounting on Mac Bonus Part: Introduction to different Seagate Backup Plus drives 7 solutions to Seagate Backup Plus not mounting/working on Mac Guide to fix Seagate external hard drive not mounting on Mac: This page will help when the 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. And some say their Seagate Backup Plus can't work after being plugged into Mac. But many users reported that they were unable to mount Seagate Backup Plus drive on Mac computers. Seagate Backup Plus external hard drive is often used for Time Machine backup.
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