| 摘要 |
PURPOSE:To contrive the increase of the recording capacity by sharing one clock track to plural data tracks and utilizing it as a guide line. CONSTITUTION:Plural data tracks 40 are provided in parallel with one clock track 30 and the clock track 30 is shared as the guide line. A data bit 42 is recorded to the data track 40 at a location corresponding to the clock bit 32 of the clock track 30. A lead-in 31 is provided at both ends of the clock track 30 to facilitate the tracking at the start of read in a form that plural clock buts are formed consecutively without any interval. No data is recorded to the corresponding data track part as to the clock part 34 succeeding to both lead-in parts 31. Thus, the recording capacity is increased without increasing the size of the card. |
