OK, finally managed to capture a screenshot of this situation... and
I've also learned how to reproduce it.  I also have a hypothesis
regarding why it happens.

A good test case is my Cowon D2 audio player, probably quite common in
the Linux world as it plays OGG and Theora, but one can see how this
situation may occur in many devices and also normal USB pendrives with
multiple partitions.

Firstly, the "Safe to remove" message only appears if there was cache to
flush to the device, so it's hard to replicate, I believe there is a
different bug suggesting that this should be made more consistent.

If you request a filesystem to be unmounted, and it has somthing to
flush, then when the unmount is complete, the message pops up.  It looks
at the hardware device name and says that this entire device is safe to
remove, but if the device has more than one partition, that may not be
true.

I am attaching a screenshot of the Cowon, which has one filesystem
labeled "D2", and another labeled "16GB_SD2" which is the SD card in the
Cowon's card slot.  You can see that unmounting the SD card triggers a
message that the entire device is safe to remove, despite the fact that
another filesystem on that device is still mounted.

This was observed on UNR 9.04 on the date shown in the image, but I have
also seen it on desktop Ubuntu over a period of time.

** Attachment added: "Incorrect "Safe to remove" message."
   http://launchpadlibrarian.net/30619938/D2_remove.png

-- 
Unmounting a partition on a USB device displays "Safe to remove" even if other 
partitions are still mounted.
https://bugs.launchpad.net/bugs/402968
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