Iomega Corporation

Lawrence Moon

Yiping Ma

Gregory M Allen

David L Hall

James M Bero

Daniel D Rochat

Kelly D Wright

José Castillo

Scott E Chase

A track map of a disk drive is generated to compensate for various conditions. A track map is a stored measurement of every 'half' servo track width on a disk. Every servo half track width is measured in the factory on a disk and then the data is stored on the disk for use during drive operations. When an individual track is accessed, the appropriate servo half track width data is pulled from memory and is used to adjust a scale factor for that local half track width. The track map may be used to compensate for various conditions including varying servo track width, microjog distance, and data track spacing.

Compensation for variable servo track width

An information storage system has structure with a head that can effect information transfers with respect to a storage medium. According to one feature, a control portion monitors a characteristic of information read from the storage medium, and can take action to reduce the likelihood of non-recoverable errors based on the characteristic. According to a different feature, the control portion moves the head to a position adjacent a portion of a surface on the storage medium, waits while moving the head relative to the surface, and then moves the head to another position adjacent a different portion of the surface. According to another feature, the control portion calculates a distance of the head from the surface based on information read from the surface, and determines based on this distance whether the head or the storage medium may fail to satisfy a criteria.

Information storage system, and a method of operating it

A system and method for intentionally servowriting tracks having 1F runout on a data storage disk using a servowriter. The center of the servowriter hub is misaligned a predetermined distance with respect to the center of rotation of the servowriter spindle motor. The data storage disk is mounted on the spindle hub and tracks are servowritten on the disk surface. The tracks are misaligned with respect to the center of the servowriter hub to form 1F runout having a 1F peak amplitude and 2F runout having a 2F peak amplitude. The 1F peak amplitude is substantially equal to the predetermined distance, and the ratio of the 1F peak amplitude to 2F peak amplitude is at least about four.

System and method for minimizing write-over encroachment in a disk due to radial sinusoidal runout at the fundamental frequency

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Layton, UT, United States of America

Lawrence Moon