Sony VGN-BX41VN User Manual page 132

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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 scan your fingerprint.
You may not be able to enroll and/or recognize your fingerprint(s) if your finger is dry or wet, wrinkled, injured, dirty, etc.
Enroll more than one fingerprint in case of inability to recognize the fingerprint.
Up to 10 fingerprints can be enrolled per person. Note that up to 21 fingerprints can be enrolled for logging onto your system using the Power-on
Security feature.
Be sure to clean your fingertip(s) and the fingerprint sensor before swiping in order to keep good recognition performance.