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).