Quantum Corporation

Robert A Johnson

George H Bellesis

James Fitzpatrick

Lawrence G Neumann

Leo Guglielmo

Tzuochang Lee

John S Judge

James R Remby

A method of positioning a selected recording channel on a recording head relative to an optical servo system includes positioning the optical servo system at a first position relative to the selected recording, processing an alignment tape to determine a lateral offset between the optical servo system and the selected recording channel and positioning the optical servo system at a second position relative to the selected recording channel using the lateral offset. An alignment tape is also provided, which includes an elongated continuous web of flexible plastic substrate material having two edges and defining a front major surface and a back major surface, a magnetic storage medium formed on the front major surface, an inert medium formed on the back major surface and a track of alignment voids for indicating actual lateral displacement of the selected recording channel relative to the optical servo system.

Optical to magnetic alignment in magnetic tape system

A thin film head for use in a tape drive includes a read portion, a write portion, and a giant magnetoresistive (GMR) element disposed in the read portion. The read and write portions have a tape bearing surface. A sensing surface of the GMR element is recessed from the tape bearing surface as a result of a lapping process and coated with a material.

Thin film recording head with a localized coating to protect against corrosion and electrostatic discharge

A method of aligning a magnetic read/write head to data tracks on a magnetic surface of a digital linear tape. The method includes writing a signal over a track of optical servo marks located on the magnetic surface of the tape with a servo channel writer, generating a position error signal from read back signals obtained from a servo channel reader and positioning the magnetic read/write head in accordance with the position error signal.

Magnetic servo of a recording head

A method of multi-channel magnetic tape recording and reading that compensates for track pitch changes. The method utilizes a closed loop servo system to adjust lateral and azimuth position of the recording head assembly. Servo information is written at a slight azimuth angle, adjacent the outer most tracks of a band of tracks. The recording angle being based on a dimensional stability coefficient of the tape. After data is written at the initial angle, the azimuth angle of the head is rotated through a predetermined range of angle during read-only to align the outermost read gaps with the servo tracks. By doing so, signal strength is maximized across all tracks, even if track pitch changes.

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Acton, MA, United States of America

Robert A Johnson