Method and apparatus for reading out data from a recording mediu

Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium

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369 4428, G11B 1722

Patent

active

059562994

ABSTRACT:
A playback apparatus prevents the position of a pick-up from deviating to a location outside a data area of a record medium. A system controller judges whether the number of tracks T to be skipped between the current read position and a target sector of a track jump is equal to or greater than a predetermined number. If the number of tracks is equal to or greater than 1,000, for example, the system controller then judges whether a track including the target sector is located within a predetermined range A from the edge of a data area on the medium which corresponds to an error that may result in the track jump. If the track including the target sector is located within the predetermined range from the edge of the data area, the system controller subtracts A from the number of tracks T to be skipped in the track jump resulting in a new number of tracks T-A. The track jump is executed by skipping (T-A) tracks while the tracking and thread servos are halted.

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patent: 5808982 (1998-09-01), Yun

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