Patent ID: 7339871

Claim:
A method, comprising: writing a data set, with a write timing, at an area on an optical disc that has spatial features that distort an analog read data signal, the distortion varying as a function of write timing, where the data set has a characterized read error rate as a function of write timing at the area that has the spatial features: reading the data set from the optical disc; determining a read error rate for the data set; and adjusting the write timing based on comparing the read error rate of the data set and the characterized read error rate as a function of write timing to provide a mark or a space on said disc that is precisely spatially located relative to at least one of said spatial features so that spatial features that would otherwise affect the timing of a transition of a binary read data signal if a transition between a mark and a space is near the spatial feature, is not detectable in the binary read data signal inasmuch as the transition between a mark and a space is not near the spatial feature.