UserEventAgent preventing external hard drive from being ejected?

I'm trying to eject an external hard drive (not used with Time Machine) but keep getting the "can't eject because one or more programs is using the drive" and asks me if I'd like to force eject.
I've quit every application, emptied the trash, restarted, verified/repaired the disk, made sure it wasn't indexing in Spotlight (there was no progress bar so I'm assuming it's not), relaunched Finder/TotalFinder, no luck. Attempting to repair or erase the drive results in an error because os x can't unmount the disk.
I ran this terminal code after a google search of this problem and this is the result:
unknown60334b106529:~ will$ lsof +fg +D /Volumes/"Toshiba External" | grep -v EVO
lsof: WARNING: can't opendir(/Volumes/Toshiba External/.Trashes): Permission denied
lsof: WARNING: can't opendir(/Volumes/Toshiba External/.Spotlight-V100/Store-V2/AC3334E1-B614-478D-8156-C951F780D844): Permission denied
lsof: WARNING: can't opendir(/Volumes/Toshiba External/.DocumentRevisions-V100): Permission denied
COMMAND   PID     USER   FD   TYPE FILE-FLAG DEVICE SIZE/OFF NODE NAME
UserEvent 729 willryan   64r   DIR         R    1,9     1292    2 /Volumes/Toshiba External
UserEvent 729 willryan   65r   DIR         R    1,9     1292    2 /Volumes/Toshiba External
Any ideas? I don't know if this is a premature sign of the drive failing and luckily I was able to back up all my files to a different drive, but I'm stumped.

I just tried it with my mac mini, same problem as above. However, when I tried it with my iMac, I was able to eject it without any issue. Weird...

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