MARK PAUL LUBRATT
Pilots at Westcliff Curv, Saint Paul, MN

6808648, Oct 26, 2004

Feb 8, 2002

10/072125

Lewis S. Damer - St. Paul MN
Stephen W. Farnsworth - Loveland CO
Robert S. Jackson - Little Canada MN
Mark P. Lubratt - White Bear Township MN
Robert C. Martin - Stillwater MN
David M. Perry - Lafayette CO
John J. Simbal - Lakeway TX
Daniel P. Stubbs - Marine-On-St.-Croix MN

Imation Corp. - Oakdale MN

B44C 122

216 65, 216 22, 2191216, 21912168

Methods and systems for laser etching of optical servo patterns on magnetic data storage media using two or more beams of laser energy produced from a single source of laser energy to produce a servo pattern on the magnetic data storage media. By using two or more etching beams, the time required to produce a servo pattern on the magnetic data storage media can be significantly reduced. Alternatively, each servo track in the servo pattern can be written more than once. The servo patterns thus formed can be read optically or they may be read magnetically using magnetic overwriting (if the servo pattern is formed in a magnetic coating on the media). In either case, the servo patterns are either permanently formed in the media when read optically, or they can be recreated after bulk erasing if they are provided using magnetic overwriting. In yet another alternative, the servo patterns may be read both magnetically and optically, with the magnetic and optical reading occurring simultaneously or sequentially.

6433951, Aug 13, 2002

Feb 17, 1999

09/251648

Mark P. Lubratt - White Bear Lake MN

Imation Corp. - Oakdale MN

G11B 5584

360 7712

Magnetic data storage tapes with etched servo patterns are disclosed along with methods of manufacturing the tapes. The servo tracks formed by etching may be read magnetically by magnetically overwriting a pattern etched into a magnetic coating on the tape, followed by detecting the electromagnetic modulation caused by the servo pattern etched into the magnetic coating. The etched servo pattern may also be read optically in addition to magnetically, with the optical writing occurring simultaneously, sequentially or both simultaneously and sequentially. Whether the servo tracks are read magnetically or magnetically and optically, the electromagnetic and/or electromagnetic/optical modulation caused by the etched pattern can be used to accurately position a read/write head on the tape.

6365061, Apr 2, 2002

Feb 17, 1999

09/251774

Lewis S. Damer - St. Paul MN
Stephen W. Farnsworth - Loveland CO
Robert S. Jackson - Little Canada MN
Mark P. Lubratt - White Bear Township MN
Robert C. Martin - Stillwater MN
David M. Perry - Lafayette CO
John J. Simbal - Lakeway TX
Daniel P. Stubbs - Marine-On-St.-Croix MN

Imation Corp. - Oakdale MN

B44C 122

216 65, 216 22, 264400, 2191216, 21912168

Methods and systems for laser etching of optical servo patterns on magnetic data storage media using two or more beams of laser energy produced from a single source of laser energy to produce a servo pattern on the magnetic data storage media. By using two or more etching beams, the time required to produce a servo pattern on the magnetic data storage media can be significantly reduced. Alternatively, each servo track in the servo pattern can be written more than once. The servo patterns thus formed can be read optically or they may be read magnetically using magnetic overwriting (if the servo pattern is formed in a magnetic coating on the media). In either case, the servo patterns are either permanently formed in the media when read optically, or they can be recreated after bulk erasing if they are provided using magnetic overwriting. In yet another alternative, the servo patterns may be read both magnetically and optically, with the magnetic and optical reading occurring simultaneously or sequentially.

6353590, Mar 5, 2002

Nov 1, 1999

09/431746

James K. Knudsen - Woodbury MN
Arne B. Boberg - Shoreview MN
Robert S. Jackson - Little Canada MN
Leslie M. Milner - Circle Pines MN
Brian K. Parliament - Woodbury MN
Daniel P. Stubbs - Marine on St. Croix MN
Mark P. Lubratt - White Bear Lake MN
Israel Tzur - Longmont CO
David M. Perry - Lafayette CO

Imation Corp. - Oakdale MN

G11B 1560

369263, 369115, 21912168

The present invention provides methods and apparatus for stabilizing data storage media during laser servowriting of optical servo tracks on the media. The apparatus includes a spindle for rotating the media during servowriting, a fixed media platform, and a media support for stabilizing the vertical position of the media during servowriting. The media support may include channels to reduce or control the formation of an air bearing in the area of servowriting to stabilize the vertical positioning of the media. The media support may also include a vacuum slot for drawing a vacuum through the channels.