Connect the drive to your Mac via USB. If your Mac only has USB-C ports and your drive has USB-A, you’ll need a dongle or adapter (consider buying a USB-C to USB-C Seagate drive if you want to avoid this).
Reformatting erases everything . If there’s pre-loaded software (like Seagate Toolkit) or sample files, copy them to your Mac first, or just download the Toolkit software later from Seagate’s website. setup seagate hard drive mac
Open Finder . You should see the drive appear on the left sidebar under "Locations." Click it. If you can drag a file onto it and it fails, you’re in read-only mode. Connect the drive to your Mac via USB