MacOS – Multiple “Disk Not Ejected Properly” messages shown after waking from sleep

It's one of the major flaws with newer seagate drives (alongside no on/off switch so you have to pull the power cord out the back and risk damaging the disk). They are just not compatible with Macs unfortunately. They go to sleep and there's no way for the Mac to reconnect to them. I've contacted Seagate about this and they said "Sorry there's nothing they can do about it, perhaps I can contact Apple and they can do something about it". Great..!

I basically don't buy Seagate any more and don't recommend Seagate to any friends or family with Macs. They just cause too many issues.

I'm using 10.6.8, I've not tried 10.8.3 as poster above suggests.

OK, I got it solved. I first mounted the disk with the image files from it's new, permanent location on the server. Then I opened iPhoto and slowly, image by image opened them. The bulk of them opened with no problem from the new location. A fair number, 100 or so out of 10,000, had lost their connection to the actual file. Most of these I was able to locate on the hard drive and re-link with no problem. A few, perhaps 20, I seem to have lost completely. None of them were of much importance. I allowed iPhoto to take it's time quitting so that it could update it's library etc. Now, even without that drive mounted to my desktop, the Screen Saver will start with a simple AppleScript and opening the Screen Saver control panel works with no trouble and does not spawn any error messages at all.