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公开(公告)号：SG42873A1
公开(公告)日：1997-10-17
申请号：SG1996000350
申请日：1993-03-24
Applicant: IBM
Inventor： OTTESEN HAL HJALMAR , SHARMA ARUN , SRI-JAYANTHA MUGHUTHAMBY
Abstract: A method for predicting and avoiding data errors by predicting disk drive read-write inhibit requirements in response to at least two parameters including a head position error and velocity with respect to the track centerline. A write or read inhibit signal is generated in response to selected combinations of these parameters to minimize soft read errors arising from track misregistration and to avoid hard errors arising from overwriting data recorded in an adjacent track. The read and write inhibit strategy is described as a pair of linguistic control rules suitable for implementation in a Fuzzy Logic Controller.
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公开(公告)号：MY125903A
公开(公告)日：2006-08-30
申请号：MYPI9903012
申请日：1999-07-16
Applicant: IBM
Inventor： SRI-JAYANTHA SRI MUTHUTHAMBY , SHARMA ARUN , DANG HIEN PHU , KAGAMI NAOYUKI , NAKAGAWA YUZO , TOKIZONO AKIRA , YONEDA ISAO
Abstract: METHODS AND SYSTEMS FOR DETECTING AND CORRECTING FOR UNDESIRABLE VIBRATIONS IMPACTING THE SERVO SYSTEMS (20,2020) IN DATA STORAGE DEVICES (10,2010). A DETECTION TECHNIQUE IS PROVIDED WHEREIN A DETECTION FILTER (40,50,140,240,2040) IS CONFIGURED TO SCAN A POSITION SIGNAL OF THE SERVO SYSTEM ACROSS A RANGE OF FREQUENCIES, AND, AT EACH RESPECTIVE SCANNED FREQUENCY, RECORD AN AMPLITUDE ASSOCIATED THEREWITH. THE RECORDED AMPLITUDES ARE EXAMINED TO DETERMINE WHETHER ANY EXCEED A THRESHOLD, THEREBY LOCATING A PEAK FREQUENCY OF THE VIBRATION. USING THE DETECTED PEAK FREQUENCY OF THE VIBRATION, A CORRECTIVE FILTER IS CONFIGURED TO OPERATE ABOUT THE PEAK FREQUENCY OF VIBRATION, THEREBY REDUCING ITS IMPACT ON THE POSITION SIGNAL IN THE SERVO SYSTEM. OPTIMUM DETECTION AND CORRECTION FILTER STRUCTURE ARE DISCLOSED, AS ARE TECHNIQUES FOR ADDRESSING FILTER STATE VECTORS AS INITIAL CONDITIONS AS THE CORRECTIVE FILTERS ARE REPEATEDLY ENGAGED DURING SUCCESSIVE SETTLE-OUT AND TRACK FOLLOW CYCLES (BETWEEN SEEKS), AS ARE CONTINUOUS ADAPTATION TECHNIQUES FOR CHANGING VIBRATION ENVIRONMENTS.FIGURE 7B
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公开(公告)号：SG48518A1
公开(公告)日：1998-04-17
申请号：SG1997000226
申请日：1997-01-31
Applicant: IBM
Inventor： SIR-JAYANTHA MATHUTHAMBY , SHARMA ARUN , DANG HIEN , SUZUKI HIROUKI
Abstract: In a direct access storage device including a rotating disk, a head positioned for interaction with said disk, an actuator for carrying said head and a servo system for operating said actuator so as to follow a substantially circular track on said disk by responding to a position error signal, a method for reducing response of the servo system to radial runout of the circular tracks, comprising the steps of obtaining radial runout data; filtering the data; storing the filtered data; subtracting the filtered data from the position error signal to obtain a corrected position error signal; and using the corrected position error signal to control the servo system. A direct access storage device in accordance with the invention includes means for obtaining radial runout data; means for filtering the data; means for storing the filtered data; means for subtracting the filtered data from the position error signal to obtain a corrected position error signal; and means for controlling the servo system using the corrected position error signal.
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公开(公告)号：CA2089788A1
公开(公告)日：1993-10-11
申请号：CA2089788
申请日：1993-02-18
Applicant: IBM
Inventor： OTTESEN HAL H , SHARMA ARUN , SRI-JAYANTHA MUTHUTHAMBY
Abstract: A method for predicting and avoiding data errors by predicting disk drive read-write inhibit requirements in response to at least two parameters including a head position error and velocity with respect to the track centerline. A write or read inhibit signal is generated in response to selected combinations of these parameters to minimize soft read errors arising from track misregistration and to avoid hard errors arising from overwriting data recorded in an adjacent track. The read and write inhibit strategy is described as a pair of linguistic control rules suitable for implementation in a Fuzzy Logic Controller.
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