Is there any way to determine what, if any applications are using the disc OS X won't let me eject? I'm pretty sure I'm not using it with any of my applications, which makes this both strange and annoying.
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Cannot eject because disc is "in use"
- Thread starter Pants Dragon
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i had a couple of these error messages with leopard, and i know i wasn't running anything that would cause that error message. i had to restart, and all was good again.
Had to do this before as well, one time it did not work so I went to disk utility and repair disk permission then restarted. Ejected fine then.
are you using Leopard? I had a couple of images stuck for a few hours barely after upgrading... seems like one of those bugs waiting to be squashed. Restarting forced the images to be released. Haven't had any more problems with it since those early 10.5 days 
Just log in and log out, if you don't want to restart. That seems to clear it up for most people.