| 摘要 |
An optical record carrier includes an information layer having substantially parallel tracks (11-16). The information is recorded in a pattern of optically detectable marks. The tracks are arranged in groups, each group including at least one first track (11, 13, 15) having broad marks (18) and at least one second track (10, 12, 14, 16) having narrow marks (17) of a second width smaller than the first width. The radiation spot (19) for which the secretary is designed to be scanned the width, is larger than the track period.
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