This is not really a good idea, forcing an eject in the middle of any operation can cause data corruption. You would be much better off to find out what the system is busy to begin with.
I'd try opening the terminal and typing "diskutil eject" and then drag the disk into your terminal window (no Parens). You could also bring up the disk utility and try ejecting in that.
Thanks for the tip Capture48. I'm a pretty new mac user and find it frustrating at times to figure out how things work. Overall, I like my mac much better than my PC. Microsoft made my decision to move to a mac extremely easy.
You get that message because Lightroom is still writing to the external drive. With the catalog on the external drive when Lightroom shuts down it has to sort & write everything to the external drive and that takes time.
Thanks Jethro, I guess that makes sense but I always shut down lightroom 1st. It never tells me it is busy. I'll try waiting longer to see what happens.
I keep my Lightroom Library on an external hard drive. Quite often when I eject the drive I get a dialog box with the message :
The disk "Lightroom_Library" wasn't ejected because one or more programs may be using it. {Try Again} {Cancel} {Force Eject}
I always have to shut down my computer while the hard drive is still attached. There are no other programs using it. Any thoughts on this? Should I be concerned about it?