This will be the name shown when the drive mounts. Next to name you will see untitled 1 where you can name the drive. Select Partition Layout and select 1 partition 5. Select the Partition tab on the right hand side of the Disk Utility Window 4. Select the Seagate drive on the left that shows the capacity 3. Open Disk Utility Applications>Utilities>Disk Utilities 2. Question: Q: How to use a Seagate Backup Plus external drive with Time Machine on iMac with OS X 10.11.2 How can I use a 5.0 TB Seagate Backup Plus with Time Machine on my iMac running OS X 10.11.2? When I say I want to use the drive with Time Machine it says I have to erase the drive first. How to fix Seagate Backup Plus not mounting, working on Mac issue? Seagate Backup Plus external hard drive is often used to back up important files.
Let's go ahead to the solutions to fix the Seagate Backup Plus not mounting/not working on Mac issue. In fact, the Seagate Backup Plus not mounting/working on Mac issue is very common among Mac users. However, still a large number of users have reported that they were unable to mount Seagate Backup Plus drive on Mac computers, or on Mac. Seagate Backup Plus portable external hard drive comes with cool features which makes backup more convenient and safe. How To Reformat Seagate Backup Drive With Mac.