The present invention relates to a device for reading from and/or writing to optical recording media (1) having an optical scanner (2) for scanning the recording medium (1) by means of a light beam (3) and for generating scanning signals (HF) from the reflected beam (3), a data slicer (5) for converting a scanning signal (HF) output by the optical scanner (2) into a binary signal (HF"), an averaging unit (6) for forming an average value (M) from the scanning signal (HF, HF") as input signal of the data slicer (5), and a control unit (14) for changing a parameter (T, OF) of the averaging unit (6).;The object of the present invention is to propose a device of this type and also a suitable method therefor in which the average value (M) can be adapted to disturbances during the scanning of the recording medium.;According to the invention, this is achieved by virtue of the fact that the control unit (14) has a unit (8, 10) for outputting a comparison value (S, HFN) and a comparator (7, 11) for comparing the average value (M) with this comparison value (S, HFN), and triggers a change in the parameter (T, OF) in the event of the comparison value being exceeded or undershot.
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