METHOD AND APPARATUS FOR DETECTING AND CORRECTING ERRORS AND ERASURES IN PRODUCT ECC-CODED DATA ARRAYS FOR DVD AND SIMILAR STORAGE SUBSYSTEMS

摘要

A method and apparatus for detecting and correcting errors and erasures in product-coded data arrays by iterative syndrome processing array data in row major order and column major order. A first dense map is formed for classifying each row containing location indicia of random errors, their correction patterns, and pointers to rows containing erasure errors. This map is used to effectuate row array random error corrections in place in memory. A second dense map is formed of location indicia and correction patterns for each pair adjacent position within a column containing erasure errors as indexed by a counterpart row pointer. The second map is used to effectuate column array erasure corrections and random error corrections in place in memory.