Error detection and recovery from magnetic tape

Details Error detection and recovery from magnetic tape Error detection and recovery from magnetic tape

1975-06-05

1976-12-07

Atkinson, Charles E.

Communications: electrical

Digital comparator systems

360 53, G06F 1110, G06K 500

Patent

active

039965589

ABSTRACT:
Improved recovery of information from magnetic tapes is provided by storing information on the tapes in the form of a number of partitions, each containing a certain number of words. A check-sum word is included at the end of each partition. When data words are stored on the tape, each partition may be of a fixed maximum length. When program lines are stored on the tape, each partition is preferably of a length such that an integral number of program lines is included in each partition. When information is read from the tape, a comparison of a sum formed from the digits stored in a partition with the associated check-sum word forms the basis for detecting an error read within a partition. An error message may be generated to alert a user to the error, while only a small amount of information on the tape is affected.

REFERENCES:
patent: 2937368 (1960-05-01), Newby
patent: 2944248 (1960-07-01), Auerbach et al.
patent: 2977047 (1961-03-01), Bloch
patent: 3686629 (1972-08-01), Yu
patent: 3753225 (1973-08-01), Liddel
W. Janus, Skip of Magnetic Tape Defective Area, IBM Technical Disclosure Bulletin, vol. 13, No. 6, Nov. 1970, pp. 1413- 1414.

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