When Preferences/Desktop/Icons/Removable Devices is selected, I expect to see icons pop up when a truly removable device is connected, however what I see is (in addition) icons for every partition on my hard disk except /boot (that is, in my case, the swap partition, /home, and /). What these have in common is that they are all LUKS-encrypted, so perhaps the module choosing what to display is confused by the names?
This still seems to be happening in 4.8. Downstream bug at: https://bugzilla.redhat.com/show_bug.cgi?id=782214
The "tuning knob" for this behavior has been moved around quite a bit since this bug was filed, and in fact, I don't recall the proper way to tune it at that time. However, something like this works right now: $ cat /etc/udev/rules.d/99-ignore-cryptvol.rules KERNEL=="sda3", ENV{UDISKS_IGNORE}="1"