Lsi Logic Corporation

Lsi Corporation

Discovision Associates

Kunjithapatham Balasubramanian

Ting Zhou

Raghuram Narayan

David Warland

Judith C Powelson

Jason M Stinebaugh

Hans Henry Hieslmair

Timothy Learmonth

Matthew Charles Bashaw

Michael P O'Neill

Terrence L Wong

Gregory A McDermott

A method of writing a mark to an optical disc includes receiving data to be written and generating a control signal for a laser pulse having a melt period that transitions to a growth period wherein the melt period is characterized by a melt power and the growth period is characterized by a growth power.

Advanced high density data write strategy

A system and method are disclosed for recording information on a phase change medium is disclosed. The method includes irradiating a region of the phase change medium with a first dose of laser energy. A first portion of the region is irradiated with a second dose of laser energy in a manner that causes the first portion of the region irradiated with the second dose of laser energy to be in a different state than a second portion of the region that is not irradiated by the second dose of laser energy.

High density data write strategy

The present invention preferably includes a shading band which is suitably electro-optically created in a grid pattern formed through a photolithographic process, so consequently, the electro optic shading band is easily eliminated or re-configured dynamically to substantially eliminate its shading effect for lower density optical disks which do not experience substantial adjacent track crosstalk (ATC). Eliminating or reconfiguring the shading effect also helps in accommodating different media types and generations and those of different manufacturers. Moreover, the electro-optic shading band suitably adjusts the amplitude, phase, frequency, polarization and/or the like of the light beam to compensate for possible material property variations, defects, misalignments or other imperfections in the reading process. The present electro-optic shading band substantially restricts or alters any portion of a light beam containing signal information read from an optical disk. In a preferred embodiment, the electro-optic shading band reduces undesired portion of the low frequency distribution in the diffraction pattern of the readout beam which results from reading marks in high density optical disks, thereby enhancing the signal relative to the noise and crosstalk in high performance optical disk drives.

Electro-optic apodization having backward compatibility and discrimination capabilities for optical disk drives

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Orlando, FL, United States of America

Kunjithapatham Balasubramanian