Motor transfer rate calibrated jumping

Method of calibration for determining a motor transfer rate to be stored in a device for scanning a selected track in a pattern of substantially parallel tracks on a record carrier (11) via a beam of radiation (24), the device comprising

• a head (22) for providing the beam,
• control means (20) for determining a position of the selected track, and for calculating a distance of moving the head based on the position of the selected track and a current position of the head,
• tracking means (25) for positioning the head on the selected track, the tracking means comprising a motor (40) for moving the head transverse to the tracks in dependence on a position signal indicative of an actual position of the head,
• position means (32) for generating the position signal in dependence on an amount of revolutions of the motor, and
• means (34) for storing the motor transfer rate, which motor transfer rate is indicative of a number of revolutions of the motor for a predefined distance of moving the head, the method comprising the steps of
• positioning the head on a first predetermined position based on a first special mark on the record carrier, and subsequently, while counting the number of revolutions of the motor,
• positioning the head on a second predetermined position based on a second special mark on the record carrier,
• determining, from the record carrier, a jump distance in a direction of movement of the head between the first special mark and the second special mark, and
• calculating the motor transfer rate based on the jump distance and said counted number of revolutions of the motor.