公开(公告)号：PL347829A1

公开(公告)日：2002-04-22

申请号：PL34782999

申请日：1999-05-10

Applicant: IBM

Inventor： OHZEKI HIDEKI ,  OKADA KENJI ,  TAKEUCHI KOHICHI

IPC: G11B21/10 ,  G11B21/08

Abstract: To provide a disk drive, a manufacturing method thereof, and a disk-drive controller which are capable of improving yield without increasing costs so significantly. When track-following control is performed, HDC 20 detects the current position of a read/write head 2, based on the reproduced output of a servo sector from a channel unit 5, and makes a calculation of servo data by employing both an integral parameter corresponding to a target track to be read onto a RAM 1 and the detected current position of the read/write head 2.

公开(公告)号：SG55374A1

公开(公告)日：1998-12-21

申请号：SG1997003416

申请日：1997-09-15

Applicant: IBM

Inventor： SAITOH TAKAHIRO ,  KIBASHI AKIRA ,  OKADA KENJI ,  OHZEKI HIDEKI

IPC: G06F3/06 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B27/10

Abstract: A disk device and a method are described for reassigning data areas (e.g. sectors) which minimize the reduction in the data transfer rate when alternate data areas are used to replace defective areas. The disk device uses a plurality of data zones with spare areas allocated in each data zone. An alternate area is allocated (a) in the spare area within the data zone where the error occurs and (b) at an angular position offset more than a predetermined angle from a position of the data in which the error occurs. The offset angle allows the device time to seek to the alternate area, read the alternate area and seek back to the area following the defective area within a single rotation of the disk.

公开(公告)号：HU0104545A2

公开(公告)日：2002-03-28

申请号：HU0104545

申请日：1999-05-10

Applicant: IBM

Inventor： OHZEKI HIDEKI ,  OKADA KENJI ,  TAKEUCHI KOHICHI

IPC: G11B21/10 ,  G11B21/08

Abstract: To provide a disk drive, a manufacturing method thereof, and a disk-drive controller which are capable of improving yield without increasing costs so significantly. When track-following control is performed, HDC 20 detects the current position of a read/write head 2, based on the reproduced output of a servo sector from a channel unit 5, and makes a calculation of servo data by employing both an integral parameter corresponding to a target track to be read onto a RAM 1 and the detected current position of the read/write head 2.

公开(公告)号：ID29258A

公开(公告)日：2001-08-16

申请号：ID20011042

申请日：1999-05-10

Applicant: IBM

Inventor： OHZEKI HIDEKI ,  OKADA KENJI ,  TAKEUCHI KOHICHI

IPC: G11B21/10 ,  G11B21/08

Abstract: To provide a disk drive, a manufacturing method thereof, and a disk-drive controller which are capable of improving yield without increasing costs so significantly. When track-following control is performed, HDC 20 detects the current position of a read/write head 2, based on the reproduced output of a servo sector from a channel unit 5, and makes a calculation of servo data by employing both an integral parameter corresponding to a target track to be read onto a RAM 1 and the detected current position of the read/write head 2.

公开(公告)号：CA2349598A1

公开(公告)日：2000-06-02

申请号：CA2349598

申请日：1999-05-10

Applicant: IBM

Inventor： OKADA KENJI ,  TAKEUCHI KOICHI ,  OHZEKI HIDEKI

IPC: G11B21/10 ,  G11B21/08

Abstract: A disk drive, method of producing the same, and disk drive controller are provided with little increase of cost at an improved yield. An HDC (20) find s the current position of a head (2) to perform track following control based on the reproduction output of a servosector from a channel (5) and performs computation about servo data by using an integration parameter corresponding to the target track which is read and stored in a RAM (1) and the current position of the head (2).