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公开(公告)号：JPH1116259A
公开(公告)日：1999-01-22
申请号：JP16729697
申请日：1997-06-24
Applicant: IBM
Inventor： UCHIIKE HIROSHI , OGASAWARA KENJI , AMANO YOSHIRO , SHIMIZU MASAHIRO , KURIHARA SHUSUKE , TSUCHIMOTO KAZUNARI , KITAZAKI NOBUYUKI , UENO SHINJI , YONEDA ISAO , YOKOE YUJI , SAI FUMINORI
Abstract: PROBLEM TO BE SOLVED: To prevent a head slider from accidentally landing. SOLUTION: The head slider provided with a transducer head is mounted on a head arm of the head mechanism and loaded on a disk by the turning of the head arm and also unloaded to the retreating position out of the disk from on the disk. A shock sensor is provided for sensing the shock received by the head mechanism from the outside. The loading operation of the head slider is started at a step S2, and when the shock is sensed at a step S3 during the loading operation, the loading is stopped at a step S5 and the unloading is carried out at a step S6 to return the head slider to the retreating position. When the unloading operation at the step S6 is finished, the head slider is returned to the step S2 and the reloading is started.
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公开(公告)号：JPH1196684A
公开(公告)日：1999-04-09
申请号：JP24270197
申请日：1997-09-08
Applicant: IBM
Inventor： TSUCHIMOTO KAZUNARI , TAKAHASHI YOSHIYO , YOKOE YUJI , SUGANUMA SHIGEMI
Abstract: PROBLEM TO BE SOLVED: To process defects on a recording medium with a small memory capacity by recording leading addresses of blocks in which defects are present and block lengths of defects, and performing recordings with respect to blocks other than recorded defective blocks. SOLUTION: Defective sectors detected by checking physical sectors at the time of manufacturing or at the time of performing a low level formating are registered in a defect map and LBAs(Logical block addresses) are assigned to remaining normal sectors. The defect map is recorded in a determined area being on a magnetic disk 1. The MPU 12 of a control part 5 reads out the defect map from the disk 1 to a RAM 14 at an operating time to instruct the recording and reproducing of data with respect to sectors to which the LBAs are assigned. Here, addresses of leading sectors of defects and lengths of defective sector group are recorded in two bytes and one byte respectively by using a variable length defect map and the map is constituted of recording areas equivalent to, for example, 2000 pairs.
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Patent Agency Ranking
公开(公告)号：JPH11126443A
公开(公告)日：1999-05-11
申请号：JP27709697
申请日：1997-10-09
Applicant: IBM
Inventor： KISAKA MASASHI , OZAWA YUTAKA , TSUCHIMOTO KAZUNARI
Abstract: PROBLEM TO BE SOLVED: To provide a disk drive, disk control method, data reading/writing method, data arranging method, and a disk-like storage medium, which are capable of preventing a nonlinear movement or the increase of the friction of a bearing even though the width of one track becomes further narrower. SOLUTION: In the magnetic disk 11 of a disk drive device 10, LBAs(logical block addresses) are read/written in such a manner that a 1st track including a specified number of continuous LBAs, a 2nd track including a specified number of continuous LBAs in succession of the specified number of continuous LBAs, and at least one track between the 1st track and 2nd track are provided when n pieces of LBAs are included per one track, and in a control part 22, the seek operation is carried out so that the track to read/write the next data is to be the track separated more than one track at least when the continuous data are read/written by moving the track.
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公开(公告)号：JPH1125625A
公开(公告)日：1999-01-29
申请号：JP17187797
申请日：1997-06-27
Applicant: IBM
Inventor： ANDO HARUO , KOBAYASHI KEIJI , YOKOE YUJI , TSUCHIMOTO KAZUNARI
Abstract: PROBLEM TO BE SOLVED: To provide a disk drive device, a load/unload device and its control method surely unloading it at a source OFF time and improving reliability. SOLUTION: The disk drive device is provided with a VCM (voice coil motor) spindle driver 12, a, magnetic head 13, an actuator mechanism 14 moving a head slider having the magnetic head 13 over the magnetic disk 11 surface and to a retreat position, a lamp block 15 and a CPU/HDC (hard disk controller) 16 controlling load/unload, controlling a speed of an actuator and controlling operation such as read-out/write-in, etc., of data for the disk 11. The CPU/HDC 16 receives a specified command issued from a host just before power off, executes this command operation, and then, executes the unload control and informs the host of command end after this unload control is ended.
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公开(公告)号：JPH10269025A
公开(公告)日：1998-10-09
申请号：JP23210297
申请日：1997-08-28
Applicant: IBM
Inventor： ANDO HARUO , KOBAYASHI KEIJI , TSUCHIMOTO KAZUNARI
Abstract: PROBLEM TO BE SOLVED: To decrease reading errors of a storage device due to the bus noises, which are caused when data are transferred between a host device and the storage device, by simultaneously discontinuing the transfer of data to the host device and the reading of data out of the storage device when a reading error is detected. SOLUTION: A control part 8 controls the total operation of a disk drive device via the execution of a control program and then performs the read/write control to a magnetic disk 1 based on the commands and data, which are supplied from an information processor (host device) 10 via a bus 7. Then the processor of the part 8 detects whether the reading of data executed by a read/ write system 5 has an error due to the noises of the bus 7. If a reading error occurs due to the noises of the bus 7, the transfer of data to the device 10 and the reading of data out of the disk 1 are simultaneously discontinued. Then only the reading of data is executed.
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公开(公告)号：JPH087203A
公开(公告)日：1996-01-12
申请号：JP13983794
申请日：1994-06-22
Applicant: IBM
Inventor： SONOBE YOSHIAKI , UCHIDA HIROSHI , TOYOOKA TAKASHI , MATSUI TAKAO , AOKI TATSUJI , IIHARA YASUHIRO , TSUCHIMOTO KAZUNARI , OZAWA YUTAKA
Abstract: PURPOSE: To enhance easily the stability of a magnetic domain of a MR head without carrying out complicated works such as disassembling and assembling etc. and reproduce data. CONSTITUTION: A drive device 28 is driven corresponding to a signal output from a controller body 40 of a HDC 30, and it records and reproduces data in a location where an access arm is pivoted at a specific angle. When data for this disk are recorded and reproduced, a bias current supplied to a reproduction element 21A of a magnetic head 20A having a MR effect is turned on/off only for a specific period by a reproduction control circuit 32A. Accordingly, as a direction of a magnetizing vector is changed within a specific period, a magnetic domain of the reproduction element 21A (MR element) is not unstable, but stabilized so that data from the disk can be reproduced stably.
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公开(公告)号：JPH10269113A
公开(公告)日：1998-10-09
申请号：JP23442497
申请日：1997-08-29
Applicant: IBM
Inventor： ANDO HARUO , KOBAYASHI KEIJI , TSUCHIMOTO KAZUNARI
Abstract: PROBLEM TO BE SOLVED: To make it easy to analyze a hang state by monitoring the time in which an instruction received from an external device is executed, and saving information in a volatile memory to a nonvolatile recording means when the execution time of the instruction exceeds a specified time. SOLUTION: The pressing time in which the MPU 12 of a control part 5 executes the instruction received from an external host device 10, is monitored and when the execution of the instruction does not ends within a specified time, the contents of a RAM 14 as the volatile memory are saved in a reserved area on a magnetic disk 1 as the nonvolatile recording means. Consequently, the disk drive device can dump the contents of the RAM 14 in case of a hang state without requiring an indication from a host device 10. Therefore, even if a hang state that can not be controlled from the host device is entered, the hang state can easily be analyzed.
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