| 摘要 |
PURPOSE:To remarkably increase the information quantity to be recorded by providing a clock bit in common to each data track. CONSTITUTION:An information recording face 1 provided on a card C is provided with a strip reference line 2, a data track 3 writing information, and a clock bit 4 taking synchronization at data write/read. In this case, the clock bit is provided to part of areas of the information recording face in common to each data track. Thus, the recording capacity of data is increased.
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