After verifying parity, the DataVault controller added 7 bits of Error Correcting Code ( ECC ) and stored the resulting 39 bits on 39 individual drives.
32.
When the packing bound is satisfied with equality, we may call such code to be perfect ( an analogous of perfect code in error correcting code ).
33.
The memory data bus is 72 bits wide, with a 64 bits used for the data path and 8 bits used for error correcting code ( ECC ).
34.
Repetition codes generally offer a poor compromise between data rate and bit error rate, and other forms of error correcting codes can provide superior performance in these areas.
35.
So, an error correcting code needs only to cope with a single bit in error in each correction word in order to cope with all likely soft errors.
36.
The Hamming distance is named after Richard Hamming, who introduced the concept in his fundamental paper on Hamming codes " Error detecting and error correcting codes " in 1950.
37.
Peter Shor first discovered this method of formulating a " quantum error correcting code " by storing the information of one qubit onto a highly entangled state of nine qubits.
38.
The error correcting code is able to correct any number of errors in any single track, or in any two tracks if the erroneous tracks can be identified by other means.
39.
The synchronization packet consists of four 10-bit words, the first three words are always the same 0x3FF, 0, 0; the fourth consists of 3 flag bits, along with an error correcting code.
40.
The a-Series uses proprietary 72-bit DIMMs with error correcting code ( ECC ) that are twice as tall as standard DIMMs and contain two rows of SDRAMs per a column instead of one.
