Inventors:
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
Assignee:
Imation Corp. - Oakdale MN
International Classification:
B44C 122
US Classification:
216 65, 216 22, 264400, 2191216, 21912168
Abstract:
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.