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公开(公告)号：US11942123B1
公开(公告)日：2024-03-26
申请号：US18177051
申请日：2023-03-01
发明人： Gary W. Calfee , Rodney Ngai , Gabor Szita
IPC分类号： G11B5/596
CPC分类号： G11B5/59688
摘要： In a disk drive that includes a magnetic head and a flexible printed circuit board (FPCB) coupled to an actuator for the magnetic head, a method of writing servo information includes: receiving a signal based on an electrical property of a material included in the FPCB, wherein the electrical property of the material changes as the actuator moves; determining a radial position of the magnetic head relative to a disk of the disk drive based on the signal; and controlling a radial velocity of the magnetic head relative to the disk of the disk drive based on the radial position.
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公开(公告)号：US11942122B1
公开(公告)日：2024-03-26
申请号：US18155633
申请日：2023-01-17
发明人： Gary W. Calfee , Gabor Szita , Jiangang Liang
CPC分类号： G11B5/59666 , G01D5/248 , G11B5/59661 , G11B5/56
摘要： A method of determining radial position of a magnetic head that includes a first read sensor and a second read sensor includes: with the first read sensor, detecting a servo spiral formed on a disk; with the second read sensor, detecting the servo spiral; measuring a time interval between when the servo spiral is detected by the first read sensor and when the servo spiral is detected by the second read sensor; and based on the time interval, determining a radial position of the magnetic head relative to the disk.
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公开(公告)号：US11205450B2
公开(公告)日：2021-12-21
申请号：US16879690
申请日：2020-05-20
摘要： In a multi-actuator drive, the effect of moving a first actuator (the so-called “aggressor actuator”) in on a second actuator (the so-called “victim actuator”) is reduced or compensated for. A victim feedforward signal is added to a microactuator control signal of the victim actuator in response to a voice-coil motor (VCM) control signal that is applied to the aggressor actuator. The feedforward signal is configured to compensate for disturbances to the victim microactuator caused by VCM commands provided to the aggressor actuator. The feedforward signal is based on a transfer function that models commands added to the victim microactuator, which is coupled to the head of the victim actuator, as a function of the aggressor VCM control signal applied to the aggressor actuator.
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公开(公告)号：US11189310B1
公开(公告)日：2021-11-30
申请号：US16879694
申请日：2020-05-29
IPC分类号： G11B5/55
摘要： In a multi-actuator drive, the effect of moving a first actuator (the so-called “aggressor actuator”) in on a second actuator (the so-called “victim actuator”) is reduced or compensated for. A victim feedforward signal for a particular head of the victim actuator is added to a microactuator control signal of the victim actuator in response to a voice-coil motor (VCM) control signal that is applied to the aggressor actuator. The feedforward signal is configured to compensate for disturbances to the victim microactuator caused by VCM commands provided to the aggressor actuator. The feedforward signal is based on a transfer function that models commands added to the victim microactuator, which is coupled to the particular head of the victim actuator, as a function of the aggressor VCM control signal applied to the aggressor actuator.
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公开(公告)号：US10665257B2
公开(公告)日：2020-05-26
申请号：US15919123
申请日：2018-03-12
发明人： Thorsten Schmidt , Gary W. Calfee , Gabor Szita , Hieu Pham
摘要： A self servo-write process in performed on two or more recording surfaces simultaneously. In a dual-stage servo system, a first fine positioning servo system that includes a first microactuator independently controls the position of a first read/write head over a first recording surface of a hard disk drive, while a second fine positioning servo system that includes a second microactuator independently controls the position of a second read/write head over a second recording surface of the hard disk drive.
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6.发明授权公开(公告)号：US11776570B2
公开(公告)日：2023-10-03
申请号：US17676010
申请日：2022-02-18
发明人： Gabor Szita
IPC分类号： G11B5/596
CPC分类号： G11B5/59627
摘要： A method for positioning a magnetic head having first and second read sensors and one write head includes: while the magnetic head is at a first position relative to a disk medium, reading first magnetic servo information written on a first surface of the disk medium, with the first read sensor, and reading second magnetic servo information written on the first surface of the disk medium with the second read sensor; determining a position error of the magnetic head based on the first and second magnetic servo information; and repositioning the magnetic head to a second position relative to the disk medium to compensate for the determined position error of the magnetic head.
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公开(公告)号：US11568894B1
公开(公告)日：2023-01-31
申请号：US17592438
申请日：2022-02-03
发明人： Gabor Szita
摘要： A method for collecting position information in a disk drive having a read head and a disk with a set of spirals formed thereon includes: while the read head crosses a first spiral included in the set of spirals, opening a first frame integration window; while the first frame integration window is open, generating first signals with the read head as the read head crosses over a first set of magnetic transitions; closing the first frame integration window; after closing the first frame integration window, generating second signals with the read head as the read head crosses over a second set of magnetic transitions; and determining a radial position of the read head by integrating amplitudes of the first signals, wherein the first set includes magnetic transitions having a first polarity, and the second set includes two or more magnetic transitions having a second polarity.
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公开(公告)号：US11688423B2
公开(公告)日：2023-06-27
申请号：US17556844
申请日：2021-12-20
CPC分类号： G11B5/5586 , G11B5/4813 , G11B5/5547 , G11B5/5578 , G11B5/59622
摘要： In a multi-actuator drive, the effect of moving a first actuator (the so-called “aggressor actuator”) in on a second actuator (the so-called “victim actuator”) is reduced or compensated for. A victim feedforward signal is added to a microactuator control signal of the victim actuator in response to a voice-coil motor (VCM) control signal that is applied to the aggressor actuator. The feedforward signal is configured to compensate for disturbances to the victim microactuator caused by VCM commands provided to the aggressor actuator. The feedforward signal is based on a transfer function that models commands added to the victim microactuator, which is coupled to the head of the victim actuator, as a function of the aggressor VCM control signal applied to the aggressor actuator.
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公开(公告)号：US11508403B1
公开(公告)日：2022-11-22
申请号：US17357799
申请日：2021-06-24
发明人： Gabor Szita , Anton Gerasimov , Jiangang Liang , Gary W. Calfee
摘要： Motion of a first actuator in a multi-actuator drive is prevented from affecting a second actuator in the drive or from being affected by the second actuator. A coupling coordinator generates a hold command for the second actuator based on an operation to be carried out using the first actuator, where the hold command is generated before commands to carry out the operation are issued. The hold command may cause an aggressor actuator in the drive to halt a disturbance-generating operation being performed by the aggressor actuator or delay initiation of such an operation that is to be performed by the aggressor actuator. The hold command may cause a victim actuator in the drive to pause the execution of a sensitive operation being performed by the victim actuator or delay initiation of such an operation that is to be performed by the victim actuator.
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公开(公告)号：US11227631B2
公开(公告)日：2022-01-18
申请号：US16882956
申请日：2020-05-26
发明人： Thorsten Schmidt , Gary W. Calfee , Gabor Szita , Hieu Pham
摘要： A self servo-write process in performed on two or more recording surfaces simultaneously. In a dual-stage servo system, a first fine positioning servo system that includes a first microactuator independently controls the position of a first read/write head over a first recording surface of a hard disk drive, while a second fine positioning servo system that includes a second microactuator independently controls the position of a second read/write head over a second recording surface of the hard disk drive.
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