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Optical Recording Format

IP.com Disclosure Number: IPCOM000048005D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08

Publishing Venue

IBM

Related People

Authors:
Arter, NK Call, MG Devore, EW [+details]

Abstract

An optical disk is manufactured with clock pulses recorded in each track. The clock pulses, recorded as pits in the optical disk surface, may be used for clocking data and for track following. One or more data bits, also recorded as pits, may be placed between clock pulses in a track. The position of clock pulses from track to track may be staggered. Clock pulses within a track may be staggered about the center line of the track and may be of a different size (length, width or depth) than data bits. In Fig. 1, three tracks are shown with FM coded data. In each track, the clock pulses are prerecorded when the optical disk is manufactured. When the disk is written upon, a data bit is or is not written halfway between clock pulses to indicate whether the data bit is a one or a zero.