Sony VPCZ13 - Manual (Page 86)

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Using Your VAIO Computer >
Using Fingerprint Authentication
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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 registration may fail if you move your finger too quickly or too slowly. Let the fingerprint sensor take about one second to scan your
fingerprint.
You may not be able to register and/or have your fingerprint(s) recognized if your finger is too dry or wet, wrinkled, injured, dirty, etc.
Register more than one fingerprint in case that the fingerprint sensor fails to recognize the fingerprint.
Be sure to clean your fingertip(s) and the fingerprint sensor before swiping in order to keep good recognition performance.
You can register only the limited number of fingerprints for logging onto your system using the Power-on Security feature (page 87) . The maximum
number of fingerprints you can register varies depending on the data amount of each fingerprint.
You can also select the fingerprint you want to use for the Power-on Security feature later.