JPS5661068A - Magnetic memory unit - Google Patents

Abstract

PURPOSE: To decrease the waiting period until readout/write-in are made, by providing registers storing respectively the position of magnetic head for write-in/readout and the prsent position of the magnetic head, comparing the difference of both output signals with a set valve at a comparison circuit and making the magnetic head to move in accordance with the output signal.

CONSTITUTION: The position of magnetic head for write-in/readout is stored in a register 3, and the present position of the magnetic head is stored in a register 4. The difference of output signals a and b from the both registers 3, 4 is compared at a given set value at a comparison circuit 5, and when the output difference between the registers 3 and 4 is less than a set value, an FF8 is set via an AND gate circuit 6, and the magnetic head is contacted with the recording medium. By determining the set value so that readout/write-in can immediately be made when the magnetic head is in contact with the recording medium, taking into consideration the time T₁ required for the movement of the magnetic head to the data and the time T₂ required for the contact between the magnetic head and the recording medium, the waiting time can be reduced.

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