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18 Février 2021
Summary: When plugging your Seagate Backup Plus into a Mac computer, you may find the drive stops working and is not mounting in Disk Utility. Have you been troubled by the issue? This post will give you 7 workable solutions to fix Seagate Backup Plus drive not mounting/working issue on Mac.
The Seagate Backup Plus 8TB is probably one of the fastest external hard disk drives we've tested. Sure, put a 1TB SSD in an external enclosure and you'd end up with something faster – but compared. The Seagate® Backup Plus Hub for Mac® is available in capacities up to 8TB. With cross-platform compatibility, exceptional reliability and speed, you can back up just about everything. Plus you can take advantage of two integrated high-speed USB 3.0 ports, and you can conveniently share your files, precious photos and videos with the included. Description Know your files are safely stored with this Seagate external hard drive. The 8TB of storage lets you save plenty of video, music and text files, and the USB 3.0 functionality provides backward compatibility with older USB 2.0 drives. This Seagate external hard drive includes a power adapter and USB cable for immediate use.
Seagate Backup Plus external hard drive is often used for Time Machine backup. But many users reported that they were unable to mount Seagate Backup Plus drive on Mac computers. And some say theirSeagate Backup Plus couldn't work on Mac after plugged in. Here is a real example:
'I really need your help. 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. It was working fine 1 month before. 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. Any idea guys?'
In fact, this issue is very common, especially for those who frequently share the same drive between different computers. This page will help when Seagate Backup Plus drive doesn't work on Mac.
For some reason, Seagate external hard drives could not be recognized by Mac. If you can't mount the Seagate Backup Plus drive in Disk Utility, the hard drive won't work on Mac. And you can't access the data stored on it. So it's very urgent to fix the problem to make it work again.

Here are solutions to the Seagate Backup Plus not working or mounting issue.
Sometimes, the Seagate Backup Plus drive won't mount on Mac is due to the bad USB port or cable. Thus, once the Seagate Backup Plus drive stops working, you can first do some routine checks as below.
To troubleshoot this problem, you first need to know if this Seagate hard drive is detected by your Mac. Open the Utilities folder in your Applications folder. Launch Disk Utility and check the left pane then. If you can't see the external hard drive in macOS, the drive probably has been physically damaged. In that case, you should send the drive to the local repair shop. Otherwise, you can move to the next solution.
If the Seagate Backup Plus is mounted in Disk Utility, you should blame the wrong computer settings or outdated computer. Fortunately, it's easy to fix these issues. Just try solution 4 and solution 5. If the external hard drive is greyed out in Disk Utility, it's not mounted. You can try right-clicking the Seagate Backup Plus and choose the 'Mount' button. If that doesn't work, the drive has some file system problems. Please follow the solution 6 to repair the problem.
If the Seagate external hard drive is mounted in Disk Utility, but it still doesn't show up on Mac. First of all, you should make sure the settings in Finder display drive icons on the desktop.
Step 1: Go to Finder > Preferences > General tab.
Step 2: Select 'External disks' under 'Show these items on the desktop' and then the connected external hard drive will appear on the desktop.
Seagate Backup Plus not mounting issue on Mac can be caused by file system problems. Disk Utility's First Aid is a built-in tool on Mac to deal with errors related to disks, such as file system corruption. So you can try to fix the unmountable/corrupted Seagate Backup Plus external hard drive in Disk Utility by following the steps below.
Step 1: Go to Utilities Disk Utility.
Step 2: Click 'View' in the top menu bar (Or click 'View' on the top window). Then select 'Show All Devices'.
Step 3: Select the Seagate Backup Plus external hard drive from the left sidebar.
Step 4: Click 'First Aid' on the top of the Disk Utility window.
Step 5: Click 'Run' to perform hard disk diagnostics and fix the not mounting/not working Seagate Backup Plus.
Software updates keep your computer and programs secure, deal with quite a few bugs, and provide new features. Out-of-date software can cause a variety of issues. It's possible that the operating system will become sluggish and the connected device may not function properly. Fortunately, you can easily update the software on Mac.
Case 1. Update the software on macOS Mojave or Catalina. If you upgrade to macOS Mojave or macOS Catalina, you should choose 'System Preferences' from the Apple menu, then click 'Software Update' to check for updates. If any updates are available, click 'Update Now' to install them.
Case 2. Update the software on earlier macOS versions. Just launch the Mac App Store, click the 'Update' tab on the top and then choose the 'Update All'.
If First Aid failed on the external hard drive, it might have some serious errors that are beyond its reparation capability. In that case, you need to recover lost data from the Seagate Backup Plus external hard drive as soon as possible.
Step 1. Recover lost data from the unmountable/corrupted Seagate Back Plus
iBoysoft Data Recovery for Mac is free external hard drive data recovery software. It can easily recover files when the hard drive is not working or mounting on Mac. Also, it canrecover deleted photos and lost data from formatted drives, unreadable drives, corrupted drives, and recover deleted/lost partitions, etc. It's compatible withmacOS 10.15/10.14/10.13/10.12/10.11/10.10/10.9/10.8/10.7.
Here is a short video tutorial which shows you how to recover lost data from unmountable/corrupted external hard drives:
Step 2: Reformat the Seagate Backup Plus to make it work
After recovering data from the unmounted Seagate Backup Plus, you can now go to Disk Utility and reformat it without worrying about data loss.
• Steps to reformat Seagate Backup Plus external hard drive
If unfortunately, you can't reformat the Seagate Backup Plus drive, it must have physical issues. In this case, you have to look for help from a local data recovery company.
You probably use a Seagate desktop drive like Backup Plus Hub and Expansion. Or you could use a Backup Plus Portable drive like Ultra Touch and Slim. No matter which Seagate Backup Plus drive you choose, it could not work on the Mac for some reason.
Therefore, it's important to know the differences between those Seagate Backup Plus drives. This helps you to use the Seagate Backup Plus drive more correctly and efficiently, and then avoid hard disk corruption.
Conclusion
No matter what caused Seagate Backup Plus not mounting, working, or readable issue on Mac, such as logical problems and physical damages, the most important thing is to back up important data or recover lost data with free Mac data recovery software. iBoysoft Data Recovery for Mac is a powerful and reliable data recovery tool on macOS which supports various external drives, including external hard drives, SD cards, USB flash drives, etc.
If you have any suggestions to solve this issue or experience any questions when using iBoysoft Data Recovery for Mac, please feel free to let us know. What is mac operating system.
