umount: /media/usbdisk: device is busy

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:

EX: lsof +D /media/usb

Find the process that’s opened the file from a specified directory. You can use this if you cannot unmount a USB drive and want to know which file is open.


# lsof /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




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



OR you can Force umount when the device is busy fuser -km /mnt/hda2