US 2026/0301764 A1Published application

Sector refresh evaluation for magnetic data storage disks

AssigneeWestern Digital Technologies, Inc.

InventorsWayne H. Vinson, Lena Hunicke-Smith

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Abstract

A Data Storage Device (DSD) includes one or more disks that each includes at least one recording surface configured to store data in a plurality of tracks, and each track includes sectors. An indication of accumulated magnetic interference for a sector range in a track is determined to have reached or exceeded a partial refresh threshold value used to determine whether to perform a refresh operation to rewrite data stored in the sector range. Based at least in part on at least one indication of accumulated magnetic interference for at least one corresponding adjacent sector range in a corresponding adjacent track, it is determined whether to perform the refresh operation on the sector range. According to one aspect, the probability of triggering an additional refresh operation on the adjacent sector range is considered in determining whether to perform the refresh operation on the sector range.

Claims20

Dependent claims

A Data Storage Device (DSD), comprising:

one or more disks, wherein each disk of the one or more disks includes at least one recording surface configured to store data in a plurality of tracks on the at least one recording surface, with each track including a plurality of sectors;
at least one memory configured to store one or more data structures configured to account for accumulated magnetic interference on particular sector ranges due, at least in part, to writes performed in proximity to the particular sector ranges, wherein each sector range of the particular sector ranges consists of one or more sectors in a single track that is less than all of the sectors in the single track;
and
circuitry configured to:
determine whether to perform a refresh operation on a sector range to rewrite data stored in the sector range based, at least in part, on an indication of accumulated magnetic interference stored in the one or more data structures for the sector range and at least one indication of accumulated magnetic interference stored in the one or more data structures for at least one corresponding adjacent sector range in a corresponding adjacent track to a track including the sector range, wherein the at least one corresponding adjacent sector range is adjacent to the sector range in a radial direction on a recording surface of the one or more disks.

2 more elements

A method for a Data Storage Device (DSD) including one or more disks, the method comprising:

determining that a sector range in a track on a recording surface of the one or more disks has an indication of accumulated magnetic interference that has reached or exceeded a partial refresh threshold value, wherein the partial refresh threshold value is less than a forced refresh threshold value that triggers a refresh operation to rewrite data stored in the sector range in response to the indication of accumulated magnetic interference reaching or exceeding the forced refresh threshold value;
and
in response to determining that the sector range has an indication of accumulated magnetic interference that has reached or exceeded the partial refresh threshold value, determining whether to proactively perform the refresh operation on the sector range to rewrite data stored in the sector range based, at least in part, on at least one indication of accumulated magnetic interference for at least one corresponding adjacent sector range in a corresponding adjacent track to the track, wherein the at least one corresponding adjacent sector range is adjacent to the sector range in a radial direction on the recording surface.

A Data Storage Device (DSD), comprising:

one or more disks, wherein each disk of the one or more disks includes at least one recording surface configured to store data in a plurality of tracks on the at least one recording surface, with each track including a plurality of sectors;
at least one memory configured to store one or more data structures configured to account for magnetic interference on particular sector ranges due, at least in part, to writes performed in proximity to the particular sector ranges, wherein each sector range of the particular sector ranges consists of one or more sectors in a single track that is less than all of the sectors in the single track;
and
means for:
determining whether to perform a refresh operation on a sector range to rewrite data stored in the sector range based, at least in part, on an indication of accumulated magnetic interference stored in the one or more data structures for the sector range and at least one indication of accumulated magnetic interference stored in the one or more data structures for at least one corresponding adjacent sector range in a corresponding adjacent track to a track including the sector range, wherein the at least one corresponding adjacent sector range is adjacent to the sector range in a radial direction on a recording surface of the one or more disks.

2 more elements

Dependencies are inferred from the claim text.