| 摘要 |
PURPOSE:To access surely an objective track without damaging compatibility between mediums by arranging an acting part of a recording and reproducing head off a line passing the rotation center of the medium to form bias information tracks on the medium. CONSTITUTION:A magnetic disc is rotated around a rotation center 1. Meanwhile, recording and reproducing cores 4A and 4B are fixed on a carriage. The carriage omitted in the figure is moved back and forth in the direction of arrows along a line 8 passing the rotation center 1. Operating gaps 5 and 6 of individual cores 4A and 4B are arranged in positions parallel with the line 8 and symmetrical with respect to the line 8. For example, when cores 4A and 4B are used alternately for odd tracks and even tracks to perform recording, tracks different in azimuth are formed. If cores used for individual tracks are determined in this manner, there is a very little probability that data on adjacent tracks are read erroneously in case of reproducing. |
