| 摘要 |
A data-recording device wherein a plurality of tracks are concentrically provided on the recording surface of a rotatable magnetic recording medium. A plurality of sector-starting positions are arranged on the respective tracks at a given circumferential interval to detect the extent to which the magnetic recording medium has been rotated, and one sector-starting position among the sector-starting positions of the respective tracks is used as a point at which the writing or reading of data is to be commenced. A circumferential angular interval between a sector-starting position provided on a given track to be used as a data write-read starting point and a similar sector-starting position provided on a track adjacent to said given track to be used as a data write-read starting point is so defined as to give a magnetic head a sufficient length of time to be shifted from said given track to the adjacent track in the time of rotating of a magnetic recording medium being rotated through the above-mentioned circumferential angular interval.
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