Optical disc having oscillating land and grooves

Details Optical disc having oscillating land and grooves Optical disc having oscillating land and grooves

1999-09-21

2000-12-26

Hindi, Nabil

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692752, 369 4413, G11B 700

Patent

active

061670227

ABSTRACT:
One or more optical discs, each having a ROM field having information with a length of at least one track formed in convex and concave pit rows, and a rewritable field capable of rewriting the information with a length of at least one track, an information unrecorded field having a length of at least one track located between the ROM field and rewritable field, the rewritable field having a spiral or concentric guide track oscillating in a radial direction, the ROM field having spiral or concentric convex and concave pit rows, and at least a part field at the rewritable field side of the information unrecorded field has a transition field having a spiral or concentric guide track oscillating in the radial direction continuously or intermittently and a track pitch To of the ROM field and a track pitch Tw between grooves and lands of the rewritable field have values such that To>Tw.

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