>From time to time I have tried to unmount a disk (removable disk such as a CD or Floppy, or Bernoulii) and gotten the message "device is busy". This can happen if I am currently logged into a directory on that device, or if a process is using the device. However sometimes It appears that the device should not be in use, yet I still get this message. ps -a does not give any clue (shows no process running that should be using the device). Is there a command to show why a mounted device might be busy (ie: who the hell is using it?). In my case it could be nfs (my removeable is mountable as a share under windows via samba).
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