Hitachi IC25N080ATMR04-0 Specifications - Page 33
Table 12: Examples of error cases., On The Fly Correctable, Error byte# for each interleave,
UPC - 000000114196
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5.8 ECC The 52 byte four way interleaved ECC processor provides user data verification and correction capability. The first 4 bytes of ECC are check bytes for user data and the other 48 bytes are Read Solomon ECC. Each interleave has 12 bytes for ECC. Hardware logic corrects up to 20 bytes (5 bytes for each interleave) errors on-the-fly. Following are some examples of error cases. An "O" means that the byte contains no error. An "X" means that at least one bit of the byte is bad. Table 12: Examples of error cases. On The Fly Correctable Byte # 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Error byte# for each interleave Interleave ABCDABCDAB C D A B C D A B C D A B C D A B C D Error pattern x x x x x x x x x x x x x x x x x x x x 0 0 0 0 5 5 5 5 Error pattern x x x x x x x x x x x x 0 0 0 0 x x x x x x x x 5 5 5 5 Uncorrectable Byte # 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Error byte# for each interleave Interleave ABCDABCDAB C D A B C D A B C D A B C D A B C D Error pattern x x x x x x x x x x x x x x x x x x x x x 0 0 0 6 5 5 5 Error pattern x 0 0 0 x 0 0 0 x 0 0 0 x 0 0 0 x 0 0 0 x 0 0 0 6 0 0 0 Travelstar 80GN Hard Disk Drive Specification 23