Spare and calibration sector management for optical WORM media

Details Spare and calibration sector management for optical WORM media Spare and calibration sector management for optical WORM media

1995-03-31

1996-08-20

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369124, 369 58, 3692751, 3692753, G11B 700

Patent

active

055485723

ABSTRACT:
The present invention provides efficient management of calibration and spare sectors on a banded optical write-once, read-many (WORM) disk. A portion of each band on the disk includes a user data area and a reserved area. Sectors in the reserved area are usable either as spare sectors, replacing defective sectors in the user area, or as calibration sectors, for use when the laser write-power level is calibrated. Sectors preferably are used for sparing from one end of the reserved area while sectors are used for calibration from the opposite end. A common overflow reserved area can also be provided for use if all of the sectors in one or more primary reserved areas associated with any of the bands have been exhausted.

REFERENCES:
patent: 5185733 (1993-02-01), Finkelstein et al.
patent: 5226027 (1993-07-01), Bakx
patent: 5239533 (1993-08-01), Yoshimaru et al.
patent: 5305298 (1994-04-01), Yokota
patent: 5347503 (1994-09-01), Koyama et al.
patent: 5388090 (1995-02-01), Hoshino et al.
patent: 5418767 (1995-05-01), Gaudet et al.
patent: 5418773 (1995-05-01), Kakx et al.

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