公开(公告)号：JP2002032970A

公开(公告)日：2002-01-31

申请号：JP2000207565

申请日：2000-07-07

Applicant: IBM

Inventor： TOKIZONO AKIRA ,  KAGAMI NAOYUKI ,  UCHIDA HIROSHI ,  KURODA TAKASHI

IPC: G11B21/08 ,  G11B5/012 ,  G11B5/54 ,  G11B5/596 ,  G11B19/04 ,  G11B21/02 ,  G11B21/10 ,  G11B21/22 ,  G11B27/30 ,  G11B27/36

Abstract: PROBLEM TO BE SOLVED: To provide a technique for attempting to maintain a servo lock state and to restore to a normal readout state even when a servo address mark(SAM) can not be detected. SOLUTION: In this device, when the SAM can not be detected, a dummy SAM is generated in timing when a servo lock is not released. When servo control processes in which the dummy SAM is used exceeds a fixed frequency by performing a servo interrupt control normally, the device starts its urgency brake control. In the urgency brake control, the moving direction of an arm is judged and current is made to flow through a VCM(voice coil motor) so that the arm is driven in a reverse direction. Moreover, feedback control is performed by using the output value of a back emf(electromotive face) circuit which is used in a loading/unloading mechanism.

公开(公告)号：JP2000137939A

公开(公告)日：2000-05-16

申请号：JP30821898

申请日：1998-10-29

Applicant: IBM

Inventor： SAKAI TATSUYA ,  TOKIZONO AKIRA ,  KAGAMI NAOYUKI ,  KURODA TAKASHI

IPC: G11B21/08 ,  G11B5/596 ,  G11B19/28 ,  G11B21/10 ,  G11B27/30 ,  G11B19/02 ,  G11B19/247

Abstract: PROBLEM TO BE SOLVED: To provide a disk drive device, a servo controller and a control device, which are capable of contributing to the improvement of performance of the disk drive device. SOLUTION: When data for showing the reproduction level of a servo pattern are supplied from a channel 5 through a servo control part 21, the calculation for the servo control is executed by an SA(servo assist) 23 independently of an MPU 12 and the calculated result is supplied to a VCM(voice coil motor) driving part 6 through a SIO(serial I/O) 22 to drive a head arm 3. The selection is made by an interruption generating part 26 with regard to whether the interruption against the MPU 12 is generated for every reproduction of the servo pattern or the interruption against the MPU 12 is generated based on condition signals from the SC(servo control part) 21, SA 23 and DC(drive control part) 25, according to the selection from the SA 23 or MPU 12.

公开(公告)号：JP2003346432A

公开(公告)日：2003-12-05

申请号：JP2002148290

申请日：2002-05-22

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

Inventor： KATO KATSUHIKO ,  KURODA TAKASHI ,  UCHIIKE HIROSHI ,  TAKASE YASUHIRO

IPC: G06F11/10 ,  G11B20/18 ,  H03M13/15

CPC classification number: G11B20/1833 ,  G11B2220/2516

Abstract: PROBLEM TO BE SOLVED: To attain the correction of a bigger error without increasing the overhead of a code.
SOLUTION: The correlation is generated among sectors 0-2 by making the exclusive OR (XOR) of user data (sector) 0, user data (sector) 1 and user data (sector) 2 to obtain virtual user data, and by producing C2 having the error correcting ability larger than that of C1 to the virtual user data, the error correction becomes available by C2 even though the error is uncorrectable (Uncorrectable) by C1.
COPYRIGHT: (C)2004,JPO

Abstract translation: 要解决的问题：在不增加代码开销的情况下获得较大误差的校正。 解决方案：通过使用户数据（扇区）0，用户数据（扇区）1和用户数据（扇区）2的异或（XOR）0获得虚拟用户数据，在扇区0-2中生成相关性，以及 通过产生具有大于C1的纠错能力的C2到虚拟用户数据，即使错误是C1不可校正（不可校正），也可通过C2获得纠错。 版权所有（C）2004，JPO

公开(公告)号：JP2003141822A

公开(公告)日：2003-05-16

申请号：JP2001325696

申请日：2001-10-23

Applicant: IBM

Inventor： KATO KATSUHIKO ,  FUKUSHIMA YUKIO ,  UEDA TETSUO ,  NAKAGAWA YUZO ,  SHIMONO EMI ,  KURODA TAKASHI ,  KOBAYASHI SHUNSUKE ,  TAMURA TETSUYA ,  SAI FUMINORI

IPC: G06F11/08 ,  G06F3/06 ,  G11B20/10 ,  G11B20/18 ,  H03M13/43

Abstract: PROBLEM TO BE SOLVED: To contribute to the generation of correct read data by increasing the probability of error corrections. SOLUTION: Reading about the same sector is performed multiple times, the majority is taken in the same address (Address), and the most frequent value is considered to be a genuine data value. For example, in an address 00, '00' is treated as a genuine data value.

公开(公告)号：JP2001216092A

公开(公告)日：2001-08-10

申请号：JP2000019379

申请日：2000-01-27

Applicant: IBM

Inventor： UCHIIKE HIROSHI ,  KURODA TAKASHI ,  KANAMARU ATSUSHI ,  NISHINOMIYA HIROMI ,  SAITO TAKAHIRO

IPC: G06F13/10 ,  G06F3/06 ,  G11B5/09

Abstract: PROBLEM TO BE SOLVED: To improve the reading efficiency to a write command that is kept waiting for its execution and also to improve performance of a hard disk drive. SOLUTION: When a data read request is received while a data write request is kept waiting for its execution, the logical block address of a write command W1 is compared with that of a read command R for deciding presence or absence of their duplication in a positional relation deciding step and a data reading step, where the read command R is executed before all write commands W are executed when no duplication of block addresses is decided.

公开(公告)号：JPH1125592A

公开(公告)日：1999-01-29

申请号：JP17251497

申请日：1997-06-27

Applicant: IBM

Inventor： KURODA TAKASHI ,  KIGAMI YUJI

IPC: G11B20/10 ,  G11B5/012 ,  G11B27/10 ,  G11B19/06

Abstract: PROBLEM TO BE SOLVED: To simplify a disk device configuration and to improve the device reliability. SOLUTION: At the time of detecting a position of a target sector on a disk 2 by skipping a data sector having a 1st area recorded in a 1st RDWTCLK and a 2nd area recorded in a 2nd RDWTCLK, a length of the sector to be skipped and an offset value based on a frequency difference between the 1st and 2nd RDWTCLK are set in a counter 5a by a control part 5b of an HDC 5, and the 1st RDWTCLK from a CLK generating part 4d of a channel IC 4 is counted to detect the position of the target sector.

公开(公告)号：JP2002268829A

公开(公告)日：2002-09-20

申请号：JP2001059941

申请日：2001-03-05

Applicant: IBM

Inventor： ANDO HARUO ,  KURODA TAKASHI ,  YOKOE YUJI ,  SATO HISAAKI

IPC: G06F12/16 ,  G06F3/06 ,  G11B5/00 ,  G11B5/012 ,  G11B5/55 ,  G11B5/596 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18

Abstract: PROBLEM TO BE SOLVED: To provide a disk drive device capable of effectively reducing the data amount of a defect map, a method for registering the defect map, etc. SOLUTION: The defect map generated as the position information of a defect sector on a recording disk constituting a hard disk drive device is registered with the position information of the start point of the defect sector, a PLBA (i), the number of tracks TCNT (i) where the defect sector continues in the radial direction of the recording disk, and the number of sectors SCNT (i) where the defect sector continues in the circumferential direction of the recording disk.

公开(公告)号：JP2001023310A

公开(公告)日：2001-01-26

申请号：JP18350499

申请日：1999-06-29

Applicant: IBM

Inventor： ANDO HARUO ,  KURODA TAKASHI

IPC: G11B20/12 ,  G06F11/00 ,  G11B20/10 ,  G11B20/18 ,  G11C29/00

Abstract: PROBLEM TO BE SOLVED: To make it possible to enhance throughput of a recording device at the time of accessing a data recording medium by discriminating a defect sector train consisting of plural defect sectors which satisfy prescribed conditions about a partial region in which an address is consecutive and is arranged or the corresponding alternate sector, and registering with the front address and a sector length in the defect map. SOLUTION: This disk device forms the primary defect map PDM (a) which individually registers physical block addresses D.ABA, of initial defect sectors. Subsequently, the disk device discriminates the defect sector train in which D.ABA is consecutive from the PDM (a) and which consists of the plural initial defect sectors existing in the same track, and forms a PDM (b) in which the defect sector train is registered with a front physical block address D.ABA.ST and a defect sector length D.LE in block. Subsequently, the D.ABA.ST is transformed into a pseudological block address F.LBA, and a PDM (c) is formed.

公开(公告)号：JP2000057707A

公开(公告)日：2000-02-25

申请号：JP23081898

申请日：1998-08-17

Applicant: IBM

Inventor： KATO KATSUHIKO ,  KURODA TAKASHI ,  SAKAI TATSUYA

IPC: G11B20/18 ,  H03M13/23

Abstract: PROBLEM TO BE SOLVED: To provide a reproduction control apparatus, a reproduction control method and a disk drive device, in which the reliability for data reproduction is enhanced. SOLUTION: When an error contained in reproduced data from maximum likelihood decoding section 24 is equal to or less than the error correction ability of an error correction system 10, data for which the error correction has been performed by holding, in a register 12, an error position and pattern determined by an error calculating section 11 are sequentially output. When an error exceeds the error correction cap ability, the data is re-read, and an output of a byte counter 7, which indicates the position of the reproduced data when a viterbi decoder error signal has been supplied, is supplied to the register 12, and the error correction is performed in accordance with the thus-supplied error position as well as the error pattern determined by the error calculating section 11.

公开(公告)号：JP2001101787A

公开(公告)日：2001-04-13

申请号：JP27332699

申请日：1999-09-27

Applicant: IBM

Inventor： KURODA TAKASHI ,  KIGAMI YUJI ,  MURAKAMI MASAYUKI

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

Abstract: PROBLEM TO BE SOLVED: To enhance the performance of the disk drive device by reducing the time required to expand track information to its memory. SOLUTION: The disk drive device is provided with a disk 35 that stores user data, a controller (HDC and MPU 21) that control read/write of the user data to/from this disk 35 and generates track information for the disk 35, and a memory (DRAM 32) that stores the user data to be read/written from/to the disk 35 and stores the track information generated by the controller (HDC and MPU 21) as well. This controller (HDC and MPU 21) transfers the generated track information to the memory (DRAM 32) by using a drive data bus 26 that transfers the user data.