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公开(公告)号：JP2002260355A
公开(公告)日：2002-09-13
申请号：JP2001052643
申请日：2001-02-27
Applicant: IBM
Inventor： HATTORI RYOHEITA , MATSUBARA NOBUYA , KOKUBO TETSUYA , UMEMURA KAORU , KAGAMI NAOYUKI
Abstract: PROBLEM TO BE SOLVED: To improve the reliability of a burst pattern inspection in a hard disk drive. SOLUTION: The writing test of test pattern data on a track boundary is added besides the writing of a test pattern in a SAT test at the track center conventionally performed and the inspection of burst patterns (A, B patterns) by the writing test at that time. Thereby, a highly sensitive inspection of C and D burst patterns sensitive to a PES signal can be conducted on the track boundary.
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2.发明专利
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
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).
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