External filesystems have two entries in Unity panel

Hello. I find the fact that Unity displays two icons for external devices ridiculous. In the attached screenshot, I have whipped a SD card into my laptop and clicked on the SD card icon in the panel to view it's contents. I really cannot understand why Unity feels the need to create another icon for Nautilus, especially since I'm still in the root directory of the card. What should happen, is that when I click on the SD card icon, a Nautilus window should open and two triangle should appear at both sides of the icon (active window). If i minimize the window and then click on the SD card icon again, then the SD card Nautilus window should reopen. This approach would be much more natural, as clicking the SD card icon would always open the current SD card window, not another instance of Nautilus.