Disposition or mounting of heads; or head supports; relative to record carriers; ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof
Skew adjustment, e.g. adjustment of the position of the first sector in each track with respect to the other tracks, for improving, e.g. access performance
