Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1985-12-12
1987-01-13
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 77, G11B 555, G11B 556
Patent
active
046368850
ABSTRACT:
Disclosed is a disk memory having a plurality of data sectors and servo sectors each provided between adjacent data sectors, spiral tracks being formed in each data sector and each servo sector. Servo information patterns are formed in each servo sector. To cause a read/write head to trace spiral tracks, the phases of the servo patterns with respect to servo tracks are sequentially displaced, from the first servo sector to the final m-th servo sector, by a value obtained by dividing the track pitch of the servo tracks by the number of servo sectors. In the m-th servo sector a servo index used for detecting that the servo sector is formed. A disk device is also disclosed which performs tracking control for the head along the spiral tracks.
REFERENCES:
patent: 4352131 (1982-09-01), Van Herk et al.
patent: 4363116 (1982-12-01), Kleuters et al.
patent: 4405956 (1983-09-01), Marshall
patent: 4419700 (1983-12-01), Ragle et al.
patent: 4502082 (1985-02-01), Ragle et al.
Nikkei Electronics "General Review on Floppy Disc with 3 to 3.5 Inches as a Base" Jun. 18, 1984, pp. 178-180.
Sugaya Toshihiro
Yamada Takehito
Kabushiki Kaisha Toshiba
Stellar George G.
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