Optical disk memory

摘要

An optical disk has neighboring land tracks, and groove tracks for separating the land tracks. Pits each having a predetermined depth are formed on the land tracks, and islands each having a predetermined height are formed on the groove track. Crosstalk from the neighbouring tracks is reduced. Other embodiments specify conditions for low crosstalk from amplitude-modulated marks (such as in phase-change or magnetooptical media) on adjacent lands and grooves. $$