Method and apparatus for marking a data block defective and re-r

Details Method and apparatus for marking a data block defective and re-r Method and apparatus for marking a data block defective and re-r

1992-02-28

1994-06-07

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

360 49, 360 48, 360 722, G11B 509, G11B 1518, G11B 1700, G11B 1902

Patent

active

053195043

ABSTRACT:
A tape recording and reproducing system records blocks of user data of predetermined size by reformatting the user data blocks into physical blocks that are recorded on tape. Each physical block is recorded as a double frame on a set of successive helical tracks, preferably 32 tracks. The system has the capability of verifying whether a physical block has been accurately recorded, and if not, the system rewrites the physical block downstream without stopping or repositioning the tape. If an accuracy verification confirmation does not occur until a next physical block is being recorded, the system demarks or invalidates that physical block being written, and rewrites both the failed physical block and that following physical block downstream of that physical block being written.

REFERENCES:
patent: Re31311 (1983-07-01), Miller
patent: 4570192 (1986-02-01), Hori
patent: 4637023 (1987-01-01), Lounsbury et al.
patent: 4774700 (1988-09-01), Satoh et al.
patent: 5091805 (1992-02-01), Odaka et al.
patent: 5122913 (1992-06-01), Yamamoto
Proposed SMPTE Standard for Television Digital Component and Composite Recording, SMPTE Journal, Mar. 1992.
John Watkinson, The D-2 Digital Video Recorder, 1990 pp. 143-183.

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