Rewrite-efficient ECC/interleaving for multi-track recording...

Details Rewrite-efficient ECC/interleaving for multi-track recording... Rewrite-efficient ECC/interleaving for multi-track recording...

2011-01-25

2011-01-25

Tzeng, Fred (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

Reexamination Certificate

active

07876516

ABSTRACT:
For writing data to multi-track tape, a received data set is received and segmented into unencoded subdata sets, each comprising an array having K2rows and K1columns. For each unencoded subdata set, N1-K1C1-parity bytes are generated for each row and N2-K2C2-parity bytes are generated for each column. The C1 and C2 parity bytes are appended to the ends of the row and column, respectively, to form encoded C1 and C2 codewords, respectively. All of the C1 codewords per data set are endowed with a specific codeword header to form a plurality of partial codeword objects (PCOs). Each PCO is mapped onto a logical data track according to information within the header. On each logical data track, adjacent PCOs are merged to form COs which are modulation encoded and mapped into synchronized COs. Then T synchronized COs are written simultaneously to the data tape where T is the number of concurrent active tracks on the data tape.

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patent: 1 850 342 (2007-10-01), None
Standard ECMA-319: “Data Interchange on 12,7 mm 384-Track Magnetic Tape Cartridges—Ultrium-1 Format”; Jun. 2001.

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