Recording/reproducing system for a magnetic recording medium inc

Details Recording/reproducing system for a magnetic recording medium inc Recording/reproducing system for a magnetic recording medium inc

1988-07-11

1990-01-30

Faber, Alan

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 61, 360 66, 360 62, G11B 2722, G11B 1502, G11B 2016, G11B 509

Patent

active

048977403

ABSTRACT:
A data separator system has a PLL circuit for out-putting data pulses and clock pulses on the basis of the read data from a magnetic recording medium. The system also includes an external synchronization detection circuit which detects the synchronization data (predetermined zero pattern data) recorded in the synchronization area of the magnetic recording medium, on the basis of the read data. When detecting the synchronization data, the synchronization detection circuit enables the PLL circuit to oscillate in synchronism with the read data. The data pulses and clock pulses output from the PLL circuit are also supplied to an internal synchronization detection circuit. On the basis of the data pulses and the clock pulses, the internal synchronization detection circuit detects the synchronization data, and upon detection thereof, a floppy disk controller performs the data readout operation. The system further comprises a preventing circuit which prevents the PLL circuit from performing the synchronizing operation to the read data, which is read out from the overwritten area in the magnetic recording medium by the preceding-erase type magnetic head.

REFERENCES:
patent: 4553178 (1985-11-01), Lynch
Imamura, et al., "Barium Ferrite Perpendicular Recording Floppy Disk", Toshiba Review No. 154, Winter 1985, pp. 18-22.

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