Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format
Patent
1997-01-10
2000-09-26
Loomis, Paul
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data in specific format
360 51, 360 53, G11B 509
Patent
active
061249947
ABSTRACT:
The present invention provides a system, method and data format wherein a redundant sync byte or group of sync bytes is provided in a data sector at a distance sufficient to isolate the redundant sync byte from the primary sync byte in the event of multiple byte defects. In a first embodiment, a redundant sync byte, or group of sync bytes, is provided in the AGC field preceding the primary sync region. Upon failure to detect the primary sync byte, an attempt is made on a subsequent revolution to read the secondary sync byte, either by holding the AGC gain prior to reaching the data block, or initiating an "early read" just prior to reaching the data block. In a second embodiment of the invention, the redundant sync byte is provided within the data field subsequent to the primary sync region. On failing to detect the primary sync byte, the secondary sync byte can be read immediately or can be postponed until a subsequent revolution. The missed first data region is reconstructed using ECC information. In third and fourth alternative embodiments, a secondary sync byte is provided either between the primary sync byte and the start of data or between the primary sync byte and AGC field.
REFERENCES:
patent: 4494234 (1985-01-01), Patel
patent: 4706250 (1987-11-01), Patel
patent: 4707681 (1987-11-01), Eggenberger et al.
patent: 4748611 (1988-05-01), Tsuyoshi et al.
patent: 4777542 (1988-10-01), Ozaki
patent: 4788685 (1988-11-01), Sako et al.
patent: 4862443 (1989-08-01), Tsuji et al.
patent: 4907215 (1990-03-01), Sako et al.
patent: 5036408 (1991-07-01), Leis et al.
patent: 5117313 (1992-05-01), Lokhoff et al.
patent: 5134529 (1992-07-01), Inazawa et al.
patent: 5170299 (1992-12-01), Moon
patent: 5220466 (1993-06-01), Coker et al.
patent: 5237574 (1993-08-01), Weng
patent: 5255131 (1993-10-01), Coker et al.
patent: 5285327 (1994-02-01), Hetzler
patent: 5319508 (1994-06-01), Tsunoda et al.
patent: 5369535 (1994-11-01), Hetzler
patent: 5379160 (1995-01-01), Otani
patent: 5418657 (1995-05-01), Machado et al.
patent: 5420730 (1995-05-01), Moon et al.
patent: 5420893 (1995-05-01), Ward
patent: 5438559 (1995-08-01), Best et al.
patent: 5440474 (1995-08-01), Hetzler
patent: 5461631 (1995-10-01), Blaum et al.
patent: 5475540 (1995-12-01), Gold
patent: 5517631 (1996-05-01), Machado et al.
patent: 5523903 (1996-06-01), Hetzler et al.
patent: 5541783 (1996-07-01), Yamamoto et al.
patent: 5589995 (1996-12-01), Saito et al.
patent: 5604464 (1997-02-01), Yamawaki
patent: 5796690 (1998-08-01), Kanno
patent: 5812335 (1998-09-01), Kool et al.
patent: 5844911 (1998-10-01), Schadegg et al.
patent: 5844920 (1998-12-01), Zook et al.
patent: 5867353 (1999-02-01), Valent
Draft International Standard ISO/IEC DIS 10089, "Information technology--130 mm rewritable optical disk cartridges for information interchange", pp. 1-106, 1990.
Patel, "Error Recovery Scheme for the IBM 3850 Mass Storage System", IBM J. Res. Develop., vol. 24, No. 1, Jan. 1980, pp. 32-42.
Bliss et al., "Fault-Tolerant Sync Byte for Run-Length-Limited Codes", IBM Technical Disclosure Bulletin, vol. 29, No. 1, Jun. 1986, pp. 151-157.
Bluestone Randall J.
Foerster Ingrid M.
International Business Machines - Corporation
Loomis Paul
Neal Regina Y.
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