Sony VAIO VGN-SZ400 Series User Manual page 124

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Customizing Your VAIO Computer
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Place your fingertip flat in the center of the fingerprint sensor.
Scan your fingerprint from the top joint of the finger to the fingertip.
Keep your finger in contact with the fingerprint sensor while swiping.
Fingerprint enrollment may fail if you move your finger too fast or too slow. Let the fingerprint sensor take about one second to swipe your finger across
the sensor.