Method and apparatus for detecting and correcting errors in data

Details Method and apparatus for detecting and correcting errors in data Method and apparatus for detecting and correcting errors in data

1991-11-12

1994-11-29

Beausoliel, Jr., Robert W.

Excavating

371 374, G06F 1100

Patent

active

053696417

ABSTRACT:
The control software and hardware in the tape drive control unit creates and manages a multiple level error detection and correction system to protect the data written on the magnetic tape. The helical scan data write circuits operate on the received stream of data records to produce two orthogonal error detection and correction codes on a scan group level. The data write circuit divides the received stream of data records into data segments, each of which contains a predetermined number of data bytes. A first of these scan group error codes is generated on a per data segment basis while a second scan group error is generated across multiple data segments. A third level error correction code is also used to protect an entire scan group rather than data on a per byte basis. The third level error correction code generator produces an error code over a predetermined number of sequentially written scan groups to enable the control unit to reconstruct an entire scan group if its data integrity is compromised.

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Patent Abstracts of Japan, vol. 12, No. 259 (p. 733), Jul. 21, 1988.

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