A processor processes data read from plural data tracks on a data-containing
medium.
The data tracks include markers. The processor determines if markers are detected
in a predetermined number of the tracks within a predetermined time interval starting
with detection of a first marker. In first and second embodiments, the number equals
all the read tracks and less than all the read tracks. In the second embodiment,
the processor asserts the markers into the data associated with the tracks that
do not have detected markers.
