Track-number computing equipment for CLV disk drives

Details Track-number computing equipment for CLV disk drives Track-number computing equipment for CLV disk drives

1989-09-07

1993-03-16

Chin, Tommy P.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4428, G11B 1722, G11B 700

Patent

active

051950685

ABSTRACT:
Track-number computing equipment for CLV disc drives used for positioning a pick-up on a target track. This equipment reads time data written on a disc, and computes the number of tracks from a reference track to the target track by using the time data. The time data is separated into high-order time data whose interval, for example, is 10 minutes, and low-order time data. Each high-order time data is associated with a pair of an offset value and a coefficient which are stored in a memory. Each offset value represents the track number corresponding to the high-order time data and each coefficient represents the rate at which the track number increases with the increase of the low-order time data. In computing the track number to the target track, the equipment reads the time data from the disc, splits it into the high-order and low-order time data, reads the offset-value and the coefficient corresponding to the high-order time data from the memory and computes the linear equation specified by the offset value and coefficient. This linear equation approximates the relationship between the low-order time data and the track number. The equipment finally obtains the track number to the target track by applying the low-order time data to the linear equation. Thus, the track number corresponding to the time data can be easily computed using the linear equation, which shortens the time required for computation.

REFERENCES:
patent: 4694441 (1987-09-01), Tomisawa et al.
patent: 4796247 (1989-01-01), Volelsang
patent: 4949323 (1990-08-01), Yoshima

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