record carrier the device can determine the type of record carrier e g by comparing the distance between the zero crossings of the s curves in a longitudinal focus scan to values stored in a table in a memory of the device the memory 36 may be part of the correction controller 35 as indicated in fig4 the comparison of the distances between the zero crossings of the s curves amounts to comparing thicknesses of cover layers 7 and or spacer layers 10 of record carriers d 3 dv 4 alternatively the distances between the maximum values of the so called central aperture signal e g the data signal 31 may be used at the end of the scanning session of a record carrier indicated by a command to eject the record carrier the stepping motor of the actuator 34 and thereby the spherical aberration corrector remains in the position for scanning the information layer of the first record carrier on starting the scan of a subsequent second record carrier the correction controller determines the type of record carrier retrieves the type of the first record carrier from the memory and compares the two when both types are the same the coarse tuning of the spherical aberration corrector using the focus error signal will start from the setting for the first record carrier possibly followed by a fine tuning step the coarse tuning and or the fine tuning can be omitted when the first and second record carrier are the same record carrier when the two types of record carrier are not the same the device may use a look up table 37 which may be arranged in the correction.