Dynamic magnetic information storage or retrieval – General recording or reproducing – Signal switching
Patent
1987-09-16
1989-07-25
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Signal switching
360 48, 360 66, G11B 1512, G11B 503, G11B 509
Patent
active
048519332
ABSTRACT:
A magnetic disk adapted for use in a magnetic disk apparatus, which has a magnetic head with a pre-erase gap and a read/write gap with a predetermined spacing therebetween, and which uses a sector servo system to position the magnetic head onto a target track of the disk, is divided into a plurality of sectors each having an address field and a data field. A spacing gap having a length corresponding to the spacing between the erase and read/write gaps is formed at the beginning of each of the address and data fields. Servo information is provided at least in the spacing gap of the address field. The magnetic disk apparatus energizes the read/write and erase gaps at different timings, so that the initiation and termination of data erasing are performed prior to the initiation and termination of data writing, respectively.
REFERENCES:
patent: 4499511 (1983-02-01), Sugaya
patent: 4631606 (1966-12-01), Sugaya
patent: 4633337 (1986-12-01), Horie et al.
patent: 4636885 (1985-12-01), Yamada et al.
patent: 4750060 (1988-06-01), Nakazawa et al.
patent: 4800174 (1981-11-01), Harman et al.
Sakai Yuji
Sugaya Toshihiro
Yamada Takehito
Canney Vincent P.
Kabushiki Kaisha Toshiba
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