Bsrgvty

The disk is mounted by sudo mount /dev/sdd5 /media/SDD/Docs and sudo mount /dev/sdd6 /media/SDD/Images and so on, thus there are some directories corresponding to the volumes of the mounted disk.

And when I wanted to eject the disk, i.e. using sudo umount /media/SDD/* to unmount the disk, there is an alert message saying

Failed to eject medium; one or more volumes on the medium are busy.

I've tried the command sudo lsof | grep "/media/SDD" to check the status of the mounted disk, but no information is shown.

Are there any commands to show what application are using the mounted disk? I want to check this to protect the files from disasters. Thank you!

UPDATE:

$ fuser -mv /media/SDD/
 USER PID ACCESS COMMAND
/media/SDD: root kernel mount /
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$ fuser -mv /media/SDD/*
 USER PID ACCESS COMMAND
/media/SDD/Data2010: root kernel mount /media/SDD/Data2010
/media/SDD/Data2012: root kernel mount /media/SDD/Data2012
/media/SDD/Docs: root kernel mount /media/SDD/Docs
/media/SDD/Doctor: root kernel mount /media/SDD/Doctor
/media/SDD/Files1: root kernel mount /media/SDD/Files1
/media/SDD/Files2: root kernel mount /media/SDD/Files2
/media/SDD/Papers: root kernel mount /media/SDD/Papers
/media/SDD/Temp: root kernel mount /media/SDD/Temp
/media/SDD/Videos: root kernel mount /media/SDD/Videos
/media/SDD/Work: root kernel mount /media/SDD/Work

The command you are looking for is fuser.

It displays all processes accessing /media/SDD by typing sudo fuser -mv /media/SDD, where the m tells it to look on the given location, the v switches the output to a human readable list instead of just a bunch of PIDs.

To automatically kill all processes (!! Use with care !!) accessing the directory, run sudo fuser -mvki /media/SDD. k means "kill" and i gives you a 2nd chance and lets you confirm each kill (which means you also can leave it and just type ...-mvk... to kill them without asking again).

To do further research on the fuser command, please read its manual by typing man fuser or online at manpages.ubuntu.com.

If I could help you and this answer is exactly what you were looking for, please don't be shy and click on the "accept" button next to the post. Otherwise feel free to ask me again. Thank you!