| 摘要 |
PROBLEM TO BE SOLVED: To shorten the production tact by producing the code word for the error correction in the manner of producing i pieces of parity symbol in the information group consisting of m+n pieces of the symbols made from that n pieces of dummy symbols are added to the information word group consisting of m pieces of information symbols, and recording it on the specific annular region as a stripe-stated mark long in the radial direction. SOLUTION: The marking is applied for preventing the pirate edition, and the accurate positional information of the mark is read out to obtain the positional information as the physical feature information of the disk. Then, this information is enciphered and recorded on the disk as a bar-code signal. As the constitution of data in the case of n=1, there are only four columns such as data columns 951a, b, c, d, and next they become ECC columns 952a, b, c, d. The data column 951d becomes 4B of the EDC. The data columns from the 951e to 951z are assumed all equivalently to have 0, then the encode calculation of the error correction code is performed and recorded on the disk as the bar code. |
