US 9,520,149 B1 · Direct current magnetoresistive jog offset compensation

Abstract

Systems and methods for compensating for magnetoresistive (MR) jog offset direct current (DC) drift in a disc drive are described. In one embodiment, a method may include determining an occurrence of NOS, for example, by monitoring disc slip, to determine when the method should proceed. An MR jog offset DC drift amount is determined for each head of the disc drive. One of several approaches may be employed for determining the MR jog offset DC drift amount. By determining an MR jog offset DC drift amount for each head, a compensation profile is determined for the drive. The determined compensation profile may then be used during operation of the disc drive to compensate for the DC drift. One of several approaches may be employed for compensating based on the compensation profile.

Claims20

Dependent claims

A storage device comprising:

a data storage medium comprising at least one disc;
at least one magnetoresistive (MR) read/write head associated with the at least one disc;
a non-operating shock (NOS) detector to determine an occurrence of NOS based at least in part on slip of the at least one disc;
an MR jog offset direct current (DC) drift detector to determine an MR jog offset DC drift amount based at least in part on a variable read performed over at least one revolution of the at least one disc using the at least one MR read/write head when the NOS detector has determined the occurrence of NOS;
and
an MR jog offset compensator to compensate for the determined MR jog offset DC drift amount using the determined DC MR jog offset for the at least one MR read/write head.

3 more elements

Dependencies are inferred from the claim text.

Direct current magnetoresistive jog offset compensation

Life of this patent

Direct current magnetoresistive jog offset compensation

Life of this patent

Abstract

Claims20