公开(公告)号：JPH01208777A

公开(公告)日：1989-08-22

申请号：JP2217988

申请日：1988-02-03

Applicant: IBM

Inventor： MITSUNE NOBUYOSHI ,  MIWA YOICHI ,  ONO HIROYUKI

IPC: G11B21/08 ,  G11B21/10

Abstract: PURPOSE: To enable a servo pattern to be efficiently written in by assembling a disk, in which a first and a second base patterns are written in, in a disk device together with a raw disk, and writing in a servo pattern on the basis of these base patterns. CONSTITUTION: On the recording face of a disk 18, a first base pattern 51 is written in which is arranged along the radius direction of the disk 18 and at a center space corresponding to the track center space, as is a second base pattern 52 which is essentially continuous along the radius direction for each position corresponding to a sector position. Then, the disk 18 is assembled in the disk device together with a raw disk 62, with a servo pattern 3 written in on the basis of the first and the second base patterns 51, 52. Consequently, even with an eccentric error generated in fixing the disk 18 on the spindle shaft, the head for the use of a poststage operation is capable of always passing on the second base pattern 52 during the rotation of the disk 18. Thus, it is possible to efficiently write in the servo pattern 3.