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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
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Arter, NK: AUTHOR [+3]

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.

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Optical Recording Format

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. The regularly spaced clock pulses may be used to clock the data during read or write operations and may also be used to provide track following for the optical recording head. In Fig. 2, clock pulses are shown for three tracks where the clock pulses from track to track are staggered. The clock interval between clock pulses in each track is the same. The clock pulses are staggered from track to track to minimize interference between tracks. This allows a tighter track spacing and thus a higher track density. In Fig. 3, the interval between clock pulses is extended and more data bits are written between clock pulses. Any number of run-length codes might be used in...