| 摘要 |
PURPOSE:To shorten write time by equalizing write of the reference time, by generating and writing the almost same number of pulses as the number of necessary pulses onto one round, and thereafter, executing a transfer for setting the measured joint time to '0', and writing a reference signal. CONSTITUTION:A selecting signal of a selecting circuit 13 of a device is set to an index write state, an index write command is given to an index patter generating circuit 14, one piece of index signal per one round is written on a disk plate by a write/read-out head 11, and an index signal (a) is outputted from a pulse forming circuit 15. Subsequently, a pseudo reference signal write command is given to a D-type FF 22, its output pseudo reference signal write control signal (d) is set to an active state, and an output pulse of a voltage control oscillating circuit 16 is transmitted to a write/read-out head 24 through a write controlling circuit 23. In this state, during one period T, an output of the circuit 16 is counted by a counter 20, processed by a comparator 18 and an up-down counter 20, the measured joint time is rewritten to '0' and a reference signal is written.
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