Bernoulli Optical Systems Company

Digital Equipment Corporation

Slobodan R Perera

David R Dodds

Stephen W Farnsworth

K John Stahl

Friedrich R Hertrich

An information read/write storage system for reading and writing data to and from a flexible magneto-optic media is shown to include a magnetic recording member, having a recording head positioned proximate the media, for recording information onto the media at a recording point, the recording point being defined as the area of the media wherein information is being recorded at any given time and an optical read/write assembly for providing focused light onto the media during reading and writing, for receiving reflected light from the media to read the information and for continuously providing focused light onto the media for heating the recording point while the magnetic recording member is recording.

Magneto-optical information storage system for flexible media having

An optical read/write storage system for reading and writing data to and from a flexible optical media is shown to include an optical read/write head for providing focused light onto the flexible media and for receiving reflected light from the flexible media and a fine movement stabilizater, connected to the optical head and positioned proximate the flexible media, for stabilizing the flexible media in a desired position so that the optical head need not be moved substantially toward or away from the media in order to maintain the light focused on the media.

Optical read/write storage system for flexible media having bernoulli

A transducer positioning system and a magnetic disk therefor for use in a disk drive unit of a data processing system. The magnetic disk contains plural servo sectors interposed between a plurality of circumferentially spaced data sectors. Each servo sector contains at least two sets of spaced servo blocks that include first and second asymmetrical, time-displaced, complementary servo information signals located in radially adjacent blocks. Respective sets of data track centerlines are aligned with the phase boundaries of an associated set of servo blocks in the servo sector. The disk drive unit includes a controller that selects one of the servo blocks and use a null detector to position a movable transducer over a data track centerline associated with the set of phase boundaries of the selected servo block. The controller additionally includes a track difference counter responsive to the null detector thereby to count zero crossings of the phase boundaries during movement of the transducer for indicating the displacement between the movable transducer and the desired data track in the data sector and for controlling the movement of the transducer.

Growing community of inventors

Boulder, CO, United States of America

Slobodan R Perera