Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1987-11-30
1989-04-04
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
360 66, G11B 509, G11B 503
Patent
active
048191035
ABSTRACT:
A data reproduction apparatus is disclosed. Read data, which is a pulse signal, is output from a magnetic disk drive in accordance with the information read by a pre-erase type magnetic head. Based on the read data, a zero pattern detector detects sync data which is constituted by zero data of a predetermined number of bits. A flip-flop outputs a predetermined permit signal using an output signal of the zero pattern detector as a trigger pulse. When the permit signal is output, a PLL circuit locks on the read data to oscillate and output data pulses and window pulses. Upon reception of the data pulses and window pulses. a floppy disk controller reads out data recorded on the magnetic recording medium. From the read data, an erased area detector detects an erased area that is an area, which has been erased by an erase head of the magnetic head and in which no information is written by a read/write head. When the erased area detector detects the erased area, an inhibition circuit inhibits the flip-flop from outputting the permit signal in order to prevent the PLL circuit from locking on the read data reproduced from the erased area.
REFERENCES:
patent: 4584616 (1986-04-01), Allen
patent: 4646281 (1987-02-01), Verboom
patent: 4688205 (1987-08-01), Abiko
patent: 4724493 (1988-02-01), Nakamura
Toshiba Review No. 154, Winter of 1985, pp. 18-22, "Barium Ferrite Perpendicular Recording Floppy Disk".
U.S. patent application Ser. No. 67,972 filed on Jun. 30, 1987.
U.S. patent application Ser. No. 66,974 filed on Jun. 29, 1987.
Canney Vincent P.
Kabushiki Kaisha Toshiba
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