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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：JPH08195046A
公开(公告)日：1996-07-30
申请号：JP430395
申请日：1995-01-13
Applicant: IBM
Inventor： OGASAWARA KENJI , YOKOE YUJI , NAKAMURA TAKASHI , YONEDA ISAO , KURISU CHIIRUN RIN
Abstract: PURPOSE: To improve the reliability of data even when reading failure due to aging physical damage occurs. CONSTITUTION: When reading failure occurs, reading condition is altered to correcting reading condition (124 to 136) corresponding to reading failure dealing stage (120, 122). Data is again read from the disk according to the altered correcting reading condition (138), and when reading failure occurs (140), reading failure dealing stage is increased (142), and it is repeatedly executed until the reading failure dealing stage exceeds a predetermined stage (144). When a predetermined stage is exceeded, a hard error is output (146). When the data can be read again from the disk (140, 148), information transferring process (reassigning) is conducted (150) the data of the residual sector is read (152).
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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.
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公开(公告)号：JP2000173152A
公开(公告)日：2000-06-23
申请号：JP33700398
申请日：1998-11-27
Applicant: IBM
Inventor： YOKOE YUJI
Abstract: PROBLEM TO BE SOLVED: To further reduce power consumption of an HDD by beforehand comparing the amount of power consumption, that is additionally required to transition to a power save mode and to recover from the power save mode, and the amount of power consumption equivalent to the delaying time of a response corresponding to a command with the amount of power consumption that is expected for the saving during the period in which it is transitioned to a power save mode. SOLUTION: Based on the information on the passed command intervals, timing of the arrival of a next command is assumed. Then, plural timings are selected to initiate the transition to a power save mode, a weighting is conducted for every timing based on the distribution of command intervals and the amount of power consumption being saved and the delay time to response to a next command are computed. Then, time to start a transition is determined so that the amount of power consumption to be saved is maximized and the delay time is made sufficiently small by using the relationship between the time, at which a transition to a power save mode is started, and the amount of power consumption to be saved and the delaying time of the response against the next command.
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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
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.
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Patent Agency Ranking
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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公开(公告)号：JPH097148A
公开(公告)日：1997-01-10
申请号：JP24283295
申请日：1995-09-21
Applicant: IBM
Inventor： NAKAMURA TAKASHI , YONEDA ISAO , YOKOE YUJI , TSUNAKO KAZUJI , HARAKO FUJIO , SUDA KATSUMI , NAKAJIMA MICHIO , OGASAWARA KENJI
Abstract: PROBLEM TO BE SOLVED: To eliminate an error due to thermal asperity by detecting a read defect on a data recording surface, varying the rotating speed of a disk and making a signal transducer which has decreased in flotation quantity collide, and breaking a projection as the thermal asperity. SOLUTION: Once the signal transducer 20 equipped with an air bearing surface(ABS) 44 and a magneto-resistive(MR) element 42 detects the projection 52 as the thermal asperity of the magnetic disk 18, the rotating speed of the disk is reduced. The ABS 44 of the signal transducer 20 which has decreased in flotation quantity by the speed reduction collides against the projection 52, which is broken, thereby eliminating the read error due to the thermal asperity.
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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：JPH0991906A
公开(公告)日：1997-04-04
申请号：JP24626395
申请日：1995-09-25
Applicant: IBM
Inventor： YONEDA ISAO , KISAKA MASASHI , YOKOE YUJI , KITAZAKI NOBUYUKI , NAKAMURA TAKASHI
Abstract: PROBLEM TO BE SOLVED: To prevent an error caused by disc shift by performing connection to the head position control means for filter means depending on the determined amount of disc shift. SOLUTION: Filter table of a head A is prepared by performing a flow for the turn on of power. A filter is turned on and a microcode on a disc is read out. In this regard, a filter is used based on a prepared table. A preset shift criterion is read out and the read head is changed to a head B. Preparation of a filter table for the head B is then started and a table is prepared for the table. If an error occurs during preparation of the table to cause a time-out, 0 is written on the table thus preparing a table. Subsequently, a maximum value of stable variable X is searched on the table and the shift state is discussed for every head. The shift state is discussed based on the table and if not a11=0 on the table, it is judged that the table is prepared normally.
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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
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.
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