Sony VGN-AR170GU1 - Manual (Page 92)

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Using Peripheral Devices
Attaching Your Computer to the Multi Function Bay Docking Station
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When the computer has no battery inserted, do not attach the computer to the multi function bay docking station.
To attach your computer to the multi function bay docking station
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To prevent loss of unsaved data, be sure to turn off your computer before attaching it to the multi function bay docking station.
1 Disconnect all peripherals from the computer.
2 Use a coin or similar object (1) to unscrew the screw (2) on the bottom of the multi function bay docking station (3).