Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1989-05-01
1991-09-10
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 49, 360 7708, 360 7711, G11B 509
Patent
active
050478800
ABSTRACT:
A magnetic disk pack includes a plurality of coaxially stacked magnetic disks on one of which is formed a servo recording surface for generating a servo positioning signal. The servo tracks on the servo recording surface include an index pattern consisting of missing pairs of dibits on adjacent pairs of odd and even numbered servo tracks. The index is formed at a starting and ending position of the tracks to mark the circumferential position thereof. In the index pattern, at least three non-missing dibit pairs are interposed between adjacent missing dibit pairs. The examples of the index patterns are: 011110, 0111110, 01111110, etc., in which four, five, or six 1s (representing the non-missing dibit pairs) are inserted between two 0s (representing missing dibit pairs). This organization of the index pattern is effective in reducing the adverse effects of the missing dibits in the index pattern upon the radial position signal obtained from the dibits on the servo tracks.
REFERENCES:
patent: 4630144 (1986-12-01), Kutaragi
patent: 4882583 (1989-11-01), Dimitri
patent: 4910617 (1990-03-01), Brunnett et al.
"Interchangeable Magentic Twelve-Disk Pack (100 Mbytes), c 6287", in the JIS Handbook: Information Processing, Japanese Standardes Association, 1986, p. 911.
Canney Vincent P.
Mitsubishi Denki & Kabushiki Kaisha
Robertson David L.
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