Method and apparatus for high speed data recovery from CD-ROMS o

Details Method and apparatus for high speed data recovery from CD-ROMS o Method and apparatus for high speed data recovery from CD-ROMS o

1997-06-23

1998-12-01

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4436, 369 50, 369 4432, G11B 700

Patent

active

058448721

ABSTRACT:
CD-ROMS of poor quality, such as those having eccentric center holes or uneven weight distributions circumferentially, tend to overload b tracking and focusing servos and to invite read errors and retries. Each CD-ROM on being loaded into a CD-ROM drive is therefore checked as to its quality preparatory to reading. The disk is first rotated at eight times the standard audio CD speed, with both tracking and focusing servo gains set at matching values. If then at least either servo malfunctions, the disk is of poor quality, fit for reading at four or two times the standard audio CD speed. If both servos function normally, on the other hand, then the disk quality is rechecked at the same speed as before but with the servo gains lowered six decibels. A malfunctioning of at least either servo at this time indicates that the disk is of intermediate quality, to be read at eight times the standard audio CD speed. On the other hand, if both servos still function normally, the disk Is of good quality, suitable for reading at 12 times the standard audio CD speed.

REFERENCES:
patent: 5065386 (1991-11-01), Takeya et al.
patent: 5084849 (1992-01-01), Ishii et al.
patent: 5101391 (1992-03-01), Ishii et al.
patent: 5357496 (1994-10-01), Ikeda et al.
patent: 5559770 (1996-09-01), Hiroki et al.
patent: 5699333 (1997-12-01), Tsutsui

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