I'm communicating a bug on Bugzilla regarding DVD and HFS+ with Fedora 15 that requires me to mount many disks to my system. (I'm not CS, nor am I a newbie so there are bits here and there missing from my experience, command line mounting HW is one o'them). To make it necessary to learn this, xWindows File Manager apps are not mounting the DVD. Everything must be done on the command line (I use bash). To now, I've worked around the trouble to unmount by logging out.
I am using #mount successfully, but #umount fails,
# umount -f /media umount2: Device or resource busy umount: /media: device is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) umount2: Device or resource busy umount2: Device or resource busy
How can the disk be busy immediately on mounting? I have not opened the contents. I've only listed the /media directory to see the disk is in fact mounted. Again, my File Manager apps are not showing the disk as mounted--another bug. So, if the File Manager is not using the disk, and I've not opened any of the contents, what process got a'hold of the disk to fail the force command?