US 2017/0263275 A1Published application

Magnetic disk device and correction method of head position

AssigneeKabushiki Kaisha Toshiba

InventorNaoki Tagami

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Abstract

According to one embodiment, a magnetic disk drive in the present embodiment includes a disk including tracks, each including servo sectors, a head, and a controller configured to acquire first correction data for repeatable runout occurring in a first direction, and second correction data different from the first correction data, to write the first correction data within a first permitted range in the first direction, to write the second correction data within a write permitted range including the first permitted range and a second permitted range in a second direction opposite to the first direction, to read at least one of the first correction data and the second correction data, and to correctly place the head.

Claims20

Dependent claims

A magnetic disk drive comprising:

a disk comprising tracks, each comprising a track center and servo sectors;
a head configured to write data to the disk and read data from the disk;
and
a controller configured to acquire first correction data for repeatable runout occurring at one of the tracks and deviating from the track center in a first direction, and second correction data for repeatable runout different from the first correction data, to write the first correction data within a first permitted range including the track center and extending from the track center in the first direction, to write the second correction data within a write permitted range including the first permitted range and a second permitted range including the track center and extending from the track center in a second direction opposite to the first direction, to read at least one of the first correction data and the second correction data, and to correctly place the head within the write permitted range.

1 more element

A head position correcting method applied to a magnetic disk drive including a disk comprising tracks, each comprising a track center and servo sectors, and a head configured to write data to the disk and read data from the disk, comprising:

acquiring first correction data for repeatable runout occurring at one of the tracks and deviating from the track center in a first direction, and second correction data for repeatable runout different from the first correction data;
writing the first correction data within a first permitted range including the track center and extending from the track center in the first direction,
writing the second correction data within a write permitted range including the first permitted range and a second permitted range including the track center and extending from the track center in a second direction opposite to the first direction;
reading at least one of the first correction data and the second correction data;
and
makes corrections to locate the head within the write permitted range.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/267,892Filed 16 Sep 2016
Priority: 10 Mar 2016
Published: 14 Sep 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G11B 5/59627
For track following on disks: aligning for runout, eccentricity or offset compensation
G11B 20/1217
Formatting, e.g. arrangement of data block or words on the record carriers: on discs
G11B 2020/1281
Control data, system data or management information, i.e. data used to access or process user data: servo information
G11B 2020/1282
Servo information: in embedded servo fields

Family

Application62/306,442Us provisional application · filed 10 Mar 2016
US 9,799,360 B2Related patent
US 2017/0263275 A1This patent

From the US filing history. Foreign family members aren’t listed.

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