Optical information recording medium

Details Optical information recording medium Optical information recording medium

1993-05-03

1995-05-09

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

360 48, G11B 509

Patent

active

054146925

ABSTRACT:
An optical information recording medium in the form of an magneto-optical recording disk with a sector format preformatted in accordance with a mark edge recording method, wherein two types of preformat patterns are provided for an area VFO2 for a PLL, positioned after an area ID1 or an area ID2 indicating a track number or a sector number, with one pattern being selected from the two types of preformat patterns and being preformatted, depending upon whether a prepit preformatted in the area ID1 or the area ID2 is completed within the area ID1 or the area ID2, or is discontinued in the area ID1 or the area ID2. The optical information recording medium may be in the form of a 90 mm ROM disk or a 90 mm magneto-optical recording disk including a partial ROM section, provided with a sector format which is preformatted in accordance with the mark edge recording method, wherein a specified data pattern is preformatted in an area GAP or wherein a specified data pattern is preformatted in part or all of areas GAP, FLAG, GAP, and ALPC.

REFERENCES:
patent: 5237552 (1993-08-01), Masood et al.
patent: 5278815 (1994-01-01), Mashimo et al.

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