Research Investment Network, Inc.

Siros Technologies, Inc.

James R Amble

LeRoy A Volz

Mark E McDonald

Andrew J Daiber

Michael V Morelli

Sergei L Sochava

Herman Ferrier

Matthew Lipson

Thomas Kridl

Sanjoy Ghose

Shunichi Nishimura

Herman A Ferrier

Tokyuki Honda

Lambrerrtus Hesselink

Andrew J Diaber

The disclosed device is directed towards an optical data storage system. The optical data storage system comprises an optical medium including a servo plane and at least one data plane. A first laser is positioned to generate a servo laser beam and address the servo plane with a first servo focus spot. A second laser is positioned to generate a read-write laser beam and address the data plane with a second read-write focus spot. A first servo system is associated with the first laser and is configured to provide focus and tracking error correction according to servo information associated with the servo plane. A second servo system is associated with the second laser and is configured to provide focus and tracking error correction according to servo information associated with the data plane.

Optical data storage system with focus and tracking error correction

An optical information storage system using optical storage media including multiple data layers or stacks wherein each of the multiple data stacks has a storage density comparable to a conventional single layer optical disk. The optical data storage system comprises an optical medium having a single dedicated servo layer and multiple data stacks which each contain an embedded servo format, a servo laser beam positioned to maintain a first focus point on the dedicated servo reference layer, a read-write laser beam positioned to maintain a second focus point on one of the data stacks, a first, dedicated servo system which provides focus and tracking error correction according to error signals generated from the dedicated servo layer, and a second, embedded servo system which provides focus and tracking error correction according to error signals generated from the data stacks. The dedicated servo layer, in different embodiments of the invention, may be positioned either below or above the data stacks in the optical medium, or interposed between data stacks. The data stacks may comprise discrete physical data layers or &ldquo;virtual&rdquo; data layers defined by a format hologram. The servo and read-write lasers may differ in wavelength and/or polarization.

Optical data storage system with multiple layer media

Growing community of inventors

Milpitas, CA, United States of America

James R Amble