On the left hand side of the Disk Utility window you’ll see all the drives connected to your Mac. Pick to Partition Your Seagate Backup Plus Drive. It seems that the Seagate recognition problem started when we upgraded to 10.13.3. Neither of the Seagates are recognized in the MacBook Pro drive utility. MacBook Pro mid 2012, MacBook Pro mid 2015, Mac Mini (All are OS 10.13.3). I read on another thread if you turn off your Mac, unplug ALL usb devices, unplug Mac for 30+ seconds, plug in Mac and turn on, plug in external drives then open Finder you will see the drives. My Seagates are both formatted OS X journaled. Giving you full read write access to an NTFS formatted drive on a Mac computer. This video will show you how to install the Paragon driver for Mac OS X.
They do recognize the 120GB Western Digital drive. The MacBook Pros do not recognize the 1 TB and 2 TB Seagate drives.
I have 3 external hard drives all formatted with MacOS Extended (journaled).
