Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1998-09-18
2000-10-17
Neyzari, Ali
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369 58, 369 48, 360 48, G11B 724
Patent
active
061342149
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a defect substitution method of a disc-shaped recording medium having a sector structure, and to an apparatus for recording and reproducing data on a disc-shaped recording medium using said defect substitution method, and more specifically relates to an optical disc defect management method of an optical disc in a recording system in which error detection and correction coding spans a plurality of sectors, and to an optical disc recording and reproducing apparatus.
DESCRIPTION OF THE PRIOR ART
High speed random access is possible with disc-shaped recording media, and a high recording density can be achieved by formatting a disc with a narrow data track pitch and bit pitch. Disc-shaped recording media can be generally categorized based on differences in the applicable recording method as either a magnetic disc or optical disc, and can be further classified as either a fixed type or removable type media based on differences in the method whereby the medium is mounted in the recording/reproducing apparatus during use. The smallest recording unit of the physical recording area to which data is generally recorded on disc-shaped recording media is called a "sector." Sectors that cannot be used for data storage also occur in disc-shaped recording media as a result of defects during manufacture or damage occurring after manufacture. In addition to data writing errors occurring as a result of writing data sectors that are defective as a result of damage to the disc-shaped recording medium itself, data writing errors attributable to the operating environment can also occur as described below.
Optical discs, of which the DVD is typical, have been widely used in recent years as a large capacity recording medium because of their high recording density. Further advances in recording density have also been achieved to further increase storage capacity. Optical discs, however, are typically manufactured from low rigidity materials such as polycarbonate, and even disc deflection resulting from the dead weight of the disc cannot be ignored. In addition, this type of optical disc is commonly used as a replaceable, removable recording medium. For use, the disc is inserted to a recording and reproducing apparatus and mounted on a rotating spindle, and the positioning precision of the disc therefore cannot be assured.
It is also common to directly insert optical discs to the recording and reproducing apparatus without housing the disc in a protective case. Even when used housed in such a protective case, however, the entire recording medium is exposed during recording and reproducing because the protective case is not airtight. That is, optical disc recording media have essentially no shielding against the ambient environment. It should be noted that the problems specific to optical recording media reside in the point that these media are different from the hard disc recording media, including both low recording density fixed discs and removable hard discs, which are also a magnetic storage medium.
In addition to problems associated with their rigidity, mounting precision, and low airtightness, when an optical disc recording medium is inserted to a recorder and recorded or played, normal recording and reproducing can be inhibited by variations in the relative position to the optical pickup, or by foreign matter in the air interfering with the laser from the optical pickup. In such cases, data reading and writing can be obstructed through a wide band of the recording area, and burst mode recording and reproduction errors occur easily, as a result of the narrow track pitch and dot pitch enabling high density recording, even if there are no disc defects or damage to the information sector of the optical disc recording medium. While such burst-mode recording and reproducing problems occur easily in optical disc recording media, they are also found in the above-noted magnetic recording media and are common to all types of disc-shaped recording medium.
"Recording defect" is
REFERENCES:
patent: 4152695 (1979-05-01), Democrate et al.
patent: 4814903 (1989-03-01), Kulakowski et al.
patent: 5528571 (1996-06-01), Funahashi et al.
Patent Abstracts of Japan, vol. 015, No. 480 (P-1284), Dec. 5, 1991 and JP 03 205661 A (Hitachi Ltd), Sep. 9, 1991.
J. R. Watkinson, "Data Integrity in Disc Drives", Wireless World, Jan. 1983, UK, vol. 89, No. 1564, pp. 76-78.
Fukushima Yoshihisa
Nagai Takahiro
Ohara Shunji
Satoh Isao
Takagi Yuji
Matsushita Electric - Industrial Co., Ltd.
Neyzari Ali
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