When I have the keyboard at home, I leave the USB connection from PC to kb plugged in. Push Menu, then Connect to PC and it's instantly connected and shows up as drive on your PC.
When it's time to disconnect, just eject from PC as you normally do, then press the Connect PC button on the SD7. Screen will say to be sure you exited properly from computer. Touch OK and it's done.
It takes only a couple of seconds to connect or disconnect.
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DonM