I currently have a relatively new Seagate Backup Plus for Mac which has worked just fine up until now. It started a few days ago when I got the popup informing me that the disk was not ejected properly, which I found odd considering when I checked, it seemed to be still plugged in. I shrugged it off, believing I might have moved it accidentally while switching positions or something like that. When I tried to use it the next day though, it would not show up on the side or on my desktop, even with my preferences checked. I thought it was a problem with the cable, but to double check I plugged it into a PC, and it was detected immediately. After ejecting it and putting it back into my MacBook, it started to work again.. only to stop not too long after. I checked the preferences on my laptop, and both of my parents PC's detect it. I'd like to fix this problem due to the fact that I have a few important files on it. Also, I just left it in for a little bit longer, and a notification popped up saying something about the disk not being readable by my laptop.