List Open Files

If you try to unmount a partition and get a message like this:

# umount /media/usbdisk/
umount: /media/usbdisk: device is busy

use the lsof command to find out what programs are using what files:

# lsof /media/usbdisk/
COMMAND  PID USER  FD TYPE DEVICE SIZE NODE NAME
bash    6925 root cwd  DIR   8,17 4096    1 /media/usbdisk/
xmms    6979 root cwd  DIR   8,17 4096    1 /media/usbdisk/

This shows that the programs bash and xmms are using the device. For an even clearer picture, use the device name rather than the mountpoint:

# lsof /dev/sdb1
COMMAND  PID USER  FD TYPE DEVICE    SIZE NODE NAME
bash    6925 root cwd  DIR   8,17    4096    1 /media/usbdisk
xmms    6979 root cwd  DIR   8,17    4096    1 /media/usbdisk
xmms    6979 root  8r  REG   8,17 2713101  377 /media/usbdisk/a.mp3

You either can wait until those processes exit or terminate them manually.

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