Seagate Technology Incorporated

Donald Everett Curtiss

Li-Ping Wang

Alexei Hiram Sacks

Thomas Young Chang

Koichi R Wago

Ian J Beresford

Joseph Leigh

David V Dougherty

Joachim Walter Ahner

David Marcus Tung

Henry Luis Lott

Valeriu Rusu

Mitchell Tomio Inouye

Frank Quan

Gabriel V Sapinoso

A method includes cutting an outer diameter into a glass substrate. An inner diameter within the outer diameter is also cut into the glass substrate. A first region inside the outer diameter and a second region inside the inner diameter are heated. The second region inside the inner diameter is cooled, wherein the cooling causes the second region to detach from the first region.

Separation of glass shapes using engineered induced thermal gradients after process cutting

A material handling apparatus adapted to support a plurality of disc-shaped platters, such as but not limited to a cassette assembly adapted to support data recording media or substrates during manufacturing. In some embodiments, a cassette assembly includes a base cassette with a base and opposing sidewalls configured to support an outermost perimeter of each of a first plurality of disc-shaped platters having a first diameter. An insert contactingly engages the base cassette. The insert has a plurality of spaced apart grooves to contactingly support an outermost perimeter of each of a second plurality of disc-shaped platters having a different, second diameter.

Cassette configurations to support platters having different diameters

A method for thermally writing a magnetic servo pattern on a magnetic disc medium prior to assembling the medium in a disc drive is provided in which the medium is first magnetized in a uniform magnetization direction. A plurality of magnetic domains are then thermally written on the medium, one magnetic domain at a time, by individually heating each magnetic domain with a light beam while exposing the magnetic domain to a magnetic field. The magnetic field has an orientation that is opposite to the uniform magnetization direction. The light beam forms an illumination pattern on the medium having a shape that at least partially defines a boundary of each magnetic domain.

Method for thermally writing servo patterns on magnetic media

In a disk replicating assembly, a blank disk is attached to one platen and a stamper is attached to the other platen. Pressure is applied so that the two platens are forced together, thereby transferring features from the stamper to the disk. A ball joint is located between a platen and the pressure train of the replicating assembly. Due to the ball joint at this location, the resulting pressure gradient when the stamper and disk are pressed together causes the one platen to swivel such that it orients itself substantially parallel to the other platen. Because the resistance of the ball joint is selected so that the one platen is able to pivot before the stamper significantly affects the disk, the fine features of the stamper are not transferred to the disk until the platens are in parallel alignment.

Self-leveling stamper module

A method of manufacturing a patterned data/information storage and retrieval medium in the form of an annular disk having an outer diameter, a central opening defining an inner diameter, and opposed first and second major surfaces, the method including inserting a smaller diameter cylindrical shaft of a stamping/imprinting tool in the central opening and biasing the inner diameter of the disk into contact with the cylindrical shaft at a pre-selected location along the inner diameter of the disk during stamping/imprinting of a pre-selected pattern such as a servo pattern in at least one of the first and second major surfaces of the disk, the biasing creating a space between the inner diameter of the disk and the surface of the cylindrical shaft which has a maximum width at a location diametrically opposite the pre-selected location. A disk drive system is then formed by mounting the patterned medium on a drive spindle shaft with the medium biased into contact with the shaft at the pre-selected location along the inner diameter of the medium, whereby proper centering of the servo pattern is provided.

Disk biasing for manufacture of servo patterned media

Photoresist recirculation and viscosity control for dip coating applications

A method and apparatus for thermally writing a magnetic servo pattern on a magnetic disc medium prior to assembling the medium in a disc drive are provided in which the medium is first magnetized in a uniform magnetization direction. A plurality of magnetic domains are then thermally written on the medium, one magnetic domain at a time, by individually heating each magnetic domain with a light beam while exposing the magnetic domain to a magnetic field. The magnetic field has an orientation that is opposite to the uniform magnetization direction. The light beam forms an illumination pattern on the medium having a shape that at least partially defines a boundary of each magnetic domain.

Method of thermally printing servo patterns on magnetic media

A method and apparatus for processing a magnetic disc prior to assembly of the disc in a disc drive storage assembly includes measuring a physical characteristic of the magnetic disc and encoding an information pattern within the magnetic disc. The information pattern is associated with the measured physical characteristic.

Growing community of inventors

Los Gatos, CA, United States of America

Donald Everett Curtiss