Comment 2 for bug 453072

The particular flash drive I'm using is a Sandisk Cruzer Micro with "U3 Smart Technology".
From what I've gathered these drives contain a small partition where the U3 installer is located. Now jaunty doesn't mount that partition, but Karmic does. It shows up as a mounted CD-Rom, seperate from the "actual USB drive" (that is, the data partition).
So the context menu entries are probably related to this, as the mounted CD shows three unmount/eject/remove entries as well.