Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data verification
Patent
1991-06-11
1993-10-05
Dzierzynski, Paul M.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data verification
369 54, G11B 2012, G11B 2018
Patent
active
052510778
ABSTRACT:
A reading method for a magnetic tape having a series of frames each constituted of a predetermined number of data blocks. For reading any given frame of the tape more quickly than heretofore in the face of a possible read error or errors, there is employed a buffer memory capable of temporarily storing the data from one complete frame preparatory to delivery to a host system. As the succesive blocks of the frame are read by an electromagnetic transducer, the data from each block is checked for an error by a check signal read from that block, and the data from only those blocks where no read error has been found are written on the buffer memory. Then, in event a read error has been found on more than a predetermined number (e.g. one) of blocks, all the blocks of the same frame are reread. During this rereading, the data from only those blocks where a read error has been found during the initial reading are checked for an error and written on the buffer memory if no error has been found. The rereading of the same frame may be repeated up to a predetermined number of times until a read error becomes found on not more than the predetermined number of blocks.
REFERENCES:
patent: 4637023 (1987-01-01), Lounsbury et al.
patent: 4638472 (1987-01-01), Ogata et al.
Dzierzynski Paul M.
Hanig Richard
Teac Corporation
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