US 7,352,526 B2 · Offset measurement method for magnetic recording head and magnetic recording/reproducing device

Abstract

A storage device has a separate type magnetic head and a discrete type magnetic recording medium on which recording tracks and recording disabled areas are alternately formed. An accurate offset of the magnetic head with respect to the magnetic recording medium is measured even if the widths of the elements of the separate type head differ. While changing the write position and read position of a magnetic recording head, a write element writes measurement data to a magnetic recording medium, a read element reads the written measurement data, and the signal quality is measured and the write offset value and the read offset value are calculated from the inflexion points of a contour line on the two-dimensional map on the measured signal quality. Even if the widths of the write element and the read element differ depending on the individual magnetic recording head, an offset with respect to the separated recording tracks can be accurately measured.

Claims20

Dependent claims

An offset measurement method for a magnetic recording head for measuring offset of the magnetic recording head with respect to a magnetic recording medium on which recording tracks and recording disabled areas are alternately formed, comprising the steps of:

writing measurement data to said magnetic recording medium by a write element and reading said written measurement data by a read element to measure signal quality while changing a write position and read position of said magnetic recording head in which said read element and said write element are separated;
and
determining a contour line on a two-dimensional map on said measured signal quality in said changed write position and read position, and calculating a write offset value and read offset value from the inflexion points of said contour line.

A magnetic recording/reproducing device, comprising:

a magnetic recording medium on which recording tracks and record disabled areas are alternately formed;
a magnetic recording head in which a read element for reading data on said recording tracks and a write element for writing data on said recording tracks are separated;
an actuator for moving said magnetic recording head in a track crossing direction of said magnetic recording medium;
a table for storing an offset value of said read element and an offset value of said write element with respect to said recording track;
and
a control unit for performing drive control for said actuator using the offset value of said read element and the offset value of said write element in said table,
wherein said table stores the offset value of said write element and the offset value of said read element which are calculated from the inflexion points of a contour line determined on a two-dimensional map on the measured signal quality by writing measurement data on said magnetic recording medium by said write element and reading said written measurement data by said read element, while changing the write position and read position of said magnetic recording head.

4 more elements

Dependencies are inferred from the claim text.

Offset measurement method for magnetic recording head and magnetic recording/reproducing device

Life of this patent

Offset measurement method for magnetic recording head and magnetic recording/reproducing device

Life of this patent

Abstract

Claims20