| 摘要 |
PURPOSE:To prevent the reduction in the brightness at observation of an oscilloscope by writing a signal on an alignment disc alternately onto a signal region and a non-signal region and limiting the gap between an erasure head and a read/wire head to a specific range. CONSTITUTION:The gap between the erasure head 2 and the read/write head 3 is LRE and there is mutual magnetic coupling. In order to eliminate the waveform interference due to the magnetic coupling, a signal is written on the medium 1 in a way that a signal region ld and a non-signal region lg are formed alternately. That is, when the erase head 2 reads the signal region ld, the read/write head 3 reads the non-signal region lg. In order to satisfy this condition, the relation shown in equation is to be satisfied. With the condition above, the brightness reduction in the observation of the oscilloscope is prevented.
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