公开(公告)号：JPH0945023A

公开(公告)日：1997-02-14

申请号：JP19010995

申请日：1995-07-26

Applicant: IBM

Inventor： OGASAWARA KENJI ,  NAKAMURA TAKASHI ,  MATSUBARA NOBUYA ,  NAKAGAWA YUZO ,  KIGAMI YUJI ,  UCHIIKE HIROSHI ,  NUMATA TSUTOMU

IPC: G11B21/10 ,  G11B5/55 ,  G11B5/596 ,  G11B21/08

Abstract: PROBLEM TO BE SOLVED: To prevent servo information from being reproduced of error and to form correct servo information, by providing a plurality of bit patterns which are not prevent principally in other servo areas than a servo start mark SSM. SOLUTION: A cylindrical support 16 is set to a shaft 12, with having one or more data-recording discs 18A, 18B loaded at an outer peripheral face thereof. A data area 52 is formed in each recording face of the discs 18A, 18B. Servo areas 50 are radially formed in the data area. A start position of the servo area is indicated by a servo start mark SSM. A plurality of bit patterns in the signal SSM are constituted so as not to be read in other servo areas, i.e., a gray code area, a sector area and a position error signal PES area. Therefore, the SSM signal is never read out in the other servo areas, and reading errors and prevented.

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.

公开(公告)号：JPH07211000A

公开(公告)日：1995-08-11

申请号：JP31878093

申请日：1993-12-17

Applicant: IBM

Inventor： KIGAMI YUJI ,  YOKOE YUJI ,  NUMATA TSUTOMU ,  NAKAMURA TAKASHI ,  OGASAWARA KENJI ,  KURACHI KOJI ,  MATSUI TAKAO ,  OKADA MAYUMI

IPC: G11B20/10 ,  G11B5/012 ,  G11B5/09 ,  G11B19/02 ,  G11B20/12 ,  G11B20/18 ,  G11B27/10

Abstract: PURPOSE: To refer to information on constitution or the like for respective sectors and to increase information quantity by permitting a hard disk controller to calculate an absolute block address to calculate a physical position in a specified zone and executing a seek operation based on the physical position. CONSTITUTION: The hard disk controller HDC 30 refers to a defect list D-LST and calculates the absolute block address ABA by all the sectors, which corresponds to a designated logic block address LBA. When a host computer requests the reading of the sectors from #L to #M in the address LBA, the absolute block address ABA is calculated to be #N. When the belonging zone Zn is set to be #Z, the min address ABA is to be MIN-ABBA(#Z) and a min cylinder is MIN-CYL(#Z), the address ABA is shown by an expression. Then, #ZN is set to be the serial numbers of the sectors. The head is switched and the seek operation is executed based on the physical position which is thus calculated.

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：JPH08185271A

公开(公告)日：1996-07-16

申请号：JP32471594

申请日：1994-12-27

Applicant: IBM

Inventor： KIGAMI YUJI ,  YAMADA MITSUHARU ,  KANAI TOSHIO ,  ISHIBASHI KAZUYUKI

IPC: G06F3/06 ,  G06F12/08 ,  G11B20/10

Abstract: PURPOSE: To efficiently and simply process the input/output of data at a high speed. CONSTITUTION: Request signals from a host computer 32 are inputted through the I/O 42 of an HDC 30 to a segment handier 36. The segment handier 36 refers to a segment table stored in a table memory 44, selects a segment, sets a segment memory 46 divided into the plural segments through a memory manager 38 and transfers the data to a disk part 11. In the segment handier 36, rules based on the principle of mutual exclusion are stored and determined beforehand and the data are held so as not to overlap the data of the same sector inside the segment memory 46 for the respective segments.

公开(公告)号：JPH10275110A

公开(公告)日：1998-10-13

申请号：JP7494997

申请日：1997-03-27

Applicant: IBM

Inventor： KANAMARU ATSUSHI ,  KAKIHARA TOSHIO ,  KIGAMI YUJI ,  SAITO TAKAHIRO

IPC: G06F3/06 ,  G06F12/08 ,  G11B19/02

Abstract: PROBLEM TO BE SOLVED: To provide the disk drive device and its control method which can make an additional read of media at need while minimizing a command overhead, and then improve the total performance. SOLUTION: The disk drive device 10 performs data transfer until final one block is left and expects the intervention of the local MPU 16 even when HIC 15 is able to perform all data transfer without the intervention of a local MPU 16 while a read command is issued and requested data hit data held in a cache memory, the local MPU 16 makes an indication for transferring the final one block once preparations for the end of the command are made, and if there are more than one block of transfer data left when the local MPU 16 instructs the HIC 15 to transfer the final one block, the HIC 15 performs all the data transfer without interrupting the data transfer at the final one block, thus completing the command.

公开(公告)号：JPH0737216A

公开(公告)日：1995-02-07

申请号：JP15500793

申请日：1993-06-25

Applicant: IBM

Inventor： KIGAMI YUJI ,  MATSUI TAKAO ,  KURACHI KOJI ,  OSAWA TOYOZO

IPC: G11B5/09 ,  G11B5/48 ,  G11B20/12 ,  G11B27/30

Abstract: PURPOSE: To improve a reading error rate on identification(ID) information in a sector servo type magnetic disk device provided with a head having a separated reading element and writing element. CONSTITUTION: One pair of ID fields 21a and 21b for recording ID information are set in each sector of each track of the magnetic disk. This one pair of ID fields are mutually separated in the direction along the track and radially deviated each other by the distance equivalent to the radial direction offset between the reading element 24 and writing element 23 related to the track. The magnetic head is positioned so as to read ID information in the ID field 21b with the reading element 23 at the time of a data writing operation on an optional track. The head is positioned so as to read ID information in the ID field 21a with the reading element 23 at the time of a data reading operation on the track.

公开(公告)号：JPH06214934A

公开(公告)日：1994-08-05

申请号：JP30835392

申请日：1992-11-18

Applicant: IBM

Inventor： KIGAMI YUJI ,  NUMATA TSUTOMU ,  SAKAI TATSUYA ,  SHIMIZU KENJI

IPC: G06F3/06 ,  G06F9/445 ,  G06F13/12 ,  G06F13/38

Abstract: PURPOSE: To provide a programmable storage controller which can minimize the intervention of a microprocessor and also excels in both extendibility and flexibility. CONSTITUTION: This controller includes a buffer 16 which stores a data transfer control program in addition to the data that are transferred between a host 10 and an external storage 14, a controller 18 which reads the data transfer control program out of the buffer 16 and carries it out, and a microprocessor 20 which starts to read the program out of the buffer 16 and to send it to the controller 18 in response to the command given from the host 10. The controller 18 controls the data that are transferred between the host 10 and the storage 14 independently of the microporcessor 20. Meanwhile, the processor 20 can carry out other jobs.

公开(公告)号：GB2285165A

公开(公告)日：1995-06-28

申请号：GB9425465

申请日：1994-12-16

Applicant: IBM

Inventor： NAKAMURA TAKASHI ,  NUMATA TSUTOMU ,  OGASAWARA KENJI ,  KIGAMI YUJI ,  KURACHI KOJI ,  OKADA MAYUMI ,  MATSUI TAKAO ,  YOKOE YUJI

IPC: G11B20/10 ,  G11B5/012 ,  G11B5/09 ,  G11B19/02 ,  G11B20/12 ,  G11B20/18 ,  G11B27/10

Abstract: A disk drive apparatus comprising a disk recording medium in which each track is divided into a servo area which stores information for identifying the track position and a plurality of data sectors wherein at least one of said data sectors crosses said servo area and a look-up table is provided for identifying the position of each sector based upon the relationship between a physical sector identifier, said position information and the capacity of the sector crossing said servo area. When a signal SP at the end of a servo area is detected in a dead state 80 during start up, a first data state 84 for the start of a sector transits to a second data state 86 for the later region of the sector being divided in accordance with the capacity stored in a current sectors pointer register 60. At the beginning of the sector, the contents of a next sectors pointer register 62 is stored in register 60 and the contents of a next sectors operation register 66 is stored in a current sectors operation register 64. Upon completion of sector processing, the first data state 84 is maintained when the next sector is contiguous. When a terminate instruction is stored in register 64, the process moves to dead state 80. When the servo area arrives, the process moves to idle state 82. Responsive to this state, the magnetic head is activated to enable read and write operation 5 for sectors having no sector ID on the disk.

公开(公告)号：GB2279491B

公开(公告)日：1997-02-05

申请号：GB9411354

申请日：1994-06-07

Applicant: IBM

Inventor： KURACHI KOJI ,  OHSAWA TOYOMI ,  MATSUI TAKAO ,  KIGAMI YUJI

IPC: G11B5/09 ,  G11B5/48 ,  G11B20/12 ,  G11B27/30 ,  G11B5/012 ,  G11B5/596 ,  G11B20/10 ,  G11B21/08

Abstract: The object is to improve the read error rate for identification (ID) information In a sector servo type magnetic disk drive with a head comprising separate read and write elements. A pair of ID fields 21a and 21b are set up in each sector In each track of a magnetic disk for recording ID Information. The pair of ID fields are separated from each other along the track and radially displaced with respect to each other by a distance equal to an offset between the read element 24 and the write element 23 associated with the track. In a data write operation for a trace the magnetic head is positioned so as to read the ID information in the ID field 21b with the read element 23. In a read operation for the track, the head is positioned so as to read the ID information in the ID field 21a with the read element 23.