When I go to reomove a usb external storage drive from device notifier it reads: Could not unmount following device: HITACHI. One or more files on this device are open within an application.

One or more files on this device are open within an application???

So what is it saying, that I've got an mp3 / jpg / whatever open in smplayer / gwenview / whatever??? If yes, then no, I have not. And how do I get it to stop doing it and unmount properly.

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BTW, everything is mounted correctly, I used solid-hardware query 'IS StorageVolume' and got udi = '/org/freedesktop/UDisks/devices/sdb1' for the drive and get this for solid-hardware unmount

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$ solid-hardware unmount /org/freedesktop/UDisks/devices/sdb1
Error: The requested operation has failed.: Error unmounting: umount exited with exit code 32: umount: /media/HITACHI: target is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))

Thanks.

Any ideas on this?

Did you try running "lsof | grep /media/HITACHI/" and seeing what processes are shown as having open files on that device?

I used one of your old posts to get as far as I did. Got the rest now, thanks.

I have now marked the thread as solved - good to see you found the solution you needed.

Sorry, forgot to mark it as solved and I forgot to mention the culprit. It's one of those multiple nepomukservicestub entries I get when I plug the external drive in (I have one normally with basic nepomuk settings active). I have to kill the processes in system monitor before I can 'eject safely', or whatever the dialogue is.

If I recall, this is a known bug in the Nepomuk Indexer / File Watcher at this point in time (I recall it being mentioned by developers).
I am not sure of the status of a bug fix for it however.