Why is Seagate Backup Plus not showing up on Mac? Guide to Seagate Backup Plus not showing up on Mac: So, it's important to know why and how to fix when the Seagate Backup Plus drive is not showing up on Mac. If you also experience Seagate Backup not working on Mac, you can't see files on the external hard drive or access them at all. I searched for all day but no Seagate firmware update available (attempt to update shows it to be current) and no other help available from Seagate 'support.' Can anybody help me cuz I'm really in need of the files on this drive? I can see the light on HD so I am sure it is getting power. Since I upgrade to Yosemite (maybe coincidental?), I find the Seagate hard drive light on but not detected on Mac. I use a Seagate 2TB Backup Plus Portable HD as my Time Machine backups drive and it had been working fine. However, many users have reported issues such as Seagate Backup Plus drive not working on Mac, Seagate Backup Plus Slim not detected, or the external hard drive not showing up on Mac. And they have several options like Ultra Touch, Slim, and Portable. Seagate Backup Plus drives are great external hard drives for Mac and PC.

Seagate backup plus slim not detected