Device or Resource Busy

An attempt to access or modify something failed as it is already in use. Probably the most common reason for seeing this is trying to unmount a disk partition while processes have open file descriptors on that device.

$ mount /dev/fd0 /floppy $ cd /floppy

(your shell now using the floppy disk)

$ umount /floppy umount /floppy: device is busy

If you want to find out why a disk is busy

fuser -vm /floppy

will list the processes that are using that disk :)

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