| 摘要 |
PURPOSE:To enable accurate reading by providing data for error checking in each data string and using one string of the data strings in blocks of divided plural data for error checking. CONSTITUTION:Each data string is constituted of data for recording of n bits and data for error checking of m bits, and data to be recorded are recorded on a data area for recording of n bits, and data for error checking of m bits are prepared based on data for recording of n bits belonging to the same string Each data string is sectioned for every l strings to make one block (areas enclosed by alternate long and two short dashes lines), and a specified string (data H) of each block is used as data for error checking. The data H is prepared based on data A-G. Thus, error checking is made based on these data for error checking at the time of reading, and accurate reading can be performed.
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