Handle unrecognized USB devices
I tried using a WR710N with two different USB keys and a SD card, all of which gave me the error message saying I needed to insert a USB storage device. A third USB key worked straight away.
Does the system only recognize certain types of formatting? (My disks were msdos formatted) If so, it might be usefull to mention this in the error. Maybe also include a line in the message saying the device will be completely wiped?
Not sure if this is worth a seperate issue: Without a working USB device I wasn't able to upload the latest firmware either: it just froze. I guess this is due to not having enough free storage present, so it might be useful to block the firmware upload if no USB device is present.