The devices displayed are associated with the host server selected from the host server drop-down menu. The Device Manager provides three distinct ways to view the devices connected to the selected host server.
To select a view, click on the device drop-down menu and select a view. The view selected will determine which devices will be displayed and how they will be displayed in the device window.
Once a device is selected, everything you do from the Device Management window (getting information, formatting, erasing), will affect this device (and/or its associated media).