i have a weird problem that googling around didn't seem to help. I have an external hard drive connected but cannot unmount it. All I've done is access and transfer some files. I found some sites that said to try lsof in terminal to see what files are being used...so here it is lsof | egrep 'Backup' Finder 506 30r REG 14,15 251063 17600 /Volumes/Backup/90B02.jpg Finder 506 32r REG 14,15 215706 17556 /Volumes/Backup/F90T03.jpg I'm not even using these files. And I've quit all applications and I still can't eject the drive. I made a copy of these files on my notebook, then dragged these files from the external hard drive to the trash. Then I tried ejecting, still can't. I try emptying the trash, but I can't cause those files are in use. I have no idea what program is using them. Is there a way to find out or force quit somehow?