公开(公告)号：JP2001243611A

公开(公告)日：2001-09-07

申请号：JP2000047042

申请日：2000-02-24

Applicant: IBM

Inventor： SUZUKI HIROMASA ,  UMEMURA KAORU ,  SHIBATA AKIRA ,  ENDO TATSUYA ,  MATSUI TAKAO ,  IKEDA MASAOMI ,  HASHIMOTO JUNJI

IPC: G11B5/00 ,  G11B5/012 ,  G11B5/48 ,  G11B5/596 ,  G11B21/10

Abstract: PROBLEM TO BE SOLVED: To reduce reproduction errors by improving the setting accuracy of a reproduction offset generated between the recording head and the reproducing head of a compound type head part. SOLUTION: The recording head records a test pattern on a plurality of tracks to be measured (S2), the amplitude of a regenerative signal by the reproducing head is measured at a plurality of different tracking positions about the respective tracks to be measured (S5), the approximate expression of a profile of the measured amplitude with respect to the tracking positions is found (S6), a position where a maximum value is given in the approximate expression is calculated as a tracking position at which the amplitude of the regenerative signal is maximum, a reproduction offset is calculated on the basis of the tracking position with the maximum amplitude (S7), and the reproduction offset of an optional track is set in a disk device on the basis of the reproduction offset about the tracks to be measured (S10).

公开(公告)号：JP2004030777A

公开(公告)日：2004-01-29

申请号：JP2002185284

申请日：2002-06-25

Applicant: Internatl Business Mach Corp ,  インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation

Inventor： KITAZAKI NOBUYUKI ,  YANASE HIROBUMI ,  TAKECHI ATSUSHI ,  OGASAWARA KENJI ,  IKEDA MASAOMI

IPC: G11B21/10 ,  G11B5/596 ,  G11B21/02

CPC classification number: G11B5/59633 ,  G11B21/02

Abstract: PROBLEM TO BE SOLVED: To record a servo pattern of track pitch individually corresponding to characteristics (write width, read width) of a head onto a recording medium of the data storage device. SOLUTION: This device is provided with a disk 20 in which TPI ID (pitch information) indicating a track pitch is recorded in the prescribed region and a head reading the TPI ID by scanning this disk and performing reading and writing of data for the disk 20 by being seek controlled based on this TPI ID. This TPI ID is recorded in a TOI ID embedded region 23 provided at an outer periphery of a data region 21 of the disk 20 as a part of a servo pattern 24. COPYRIGHT: (C)2004,JPO

公开(公告)号：JP2002298307A

公开(公告)日：2002-10-11

申请号：JP2001097183

申请日：2001-03-29

Applicant: IBM

Inventor： SUZUKI HIROMASA ,  ASANO HIDEO ,  NAGANO ARIYOSHI ,  NAKAJIMA MICHIO ,  IKEDA MASAOMI ,  MURAI MASASHI

IPC: G11B5/027 ,  G11B5/00 ,  G11B5/012 ,  G11B5/035 ,  G11B5/09

Abstract: PROBLEM TO BE SOLVED: To improve the overwrite performance in the initial stage of write. SOLUTION: A write current W1 which is obtained by adding a boost current (Wboost) to a nominal current (Wnom) is supplied to a write head in the initial stage of the write, and after that time, the write current W2 consisting of the nominal current (Wnom) is supplied to the write-head.