Ecc; Figure 14. Examples Of Error Cases - IBM DJSA-210 - Travelstar 10 GB Hard Drive Specifications

5.8 ECC

The 40 byte three 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 36 bytes are Read Solomon ECC. Each
interleave has 12 bytes for ECC. Hardware logic corrects up to 15 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.
On The Fly correctable
Byte #
Interleave
Error pattern
Error pattern
Uncorrectable
Byte #
Interleave
Error pattern
Error pattern

Figure 14. Examples of error cases.

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7
A B C A B C A B C A B C A B C A B C
X X X X X X X X X X X X X X X O O O
X X X X X X X X X O O O X X X X X X
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7
A B C A B C A B C A B C A B C A B C
X X X X X X X X X X X X X X X X O O
X O O X O O X O O X O O X O O X O O
Travelstar 32GH/30GT/20GN hard disk drive specifications
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
21
Error byte # for
each interleave
C
A B
5 5 5
5 5 5
Error byte # for
each interleave
C
A B
6 5 5
6 0 0