I installed the USB driver on my PC (Acer 1410) running Windows 7. I have no problem connecting and copying files, but there is nothing in the A100 user guide about disconnecting. Normally with Windows 7 I right-click the device in Windows Explorer and choose "Eject", after which I get message that I can safely disconnect. However, when I right-click "Acer ICONIA TAB A100", there is no "Eject" selection. I hesitate to just rip out the USB cable, so I have been shutting the computer down every time. How can I safely disconnect without shutting down?