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1. 发明授权

US11568894B1 Reducing the effect of spiral sync marks in non-coherent repeatable runout 有权
公开(公告)号：US11568894B1
公开(公告)日：2023-01-31
申请号：US17592438
申请日：2022-02-03
申请人： KABUSHIKI KAISHA TOSHIBA , TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
发明人： Gabor Szita
IPC分类号： G11B5/00 , G11B5/54 , G11B21/08 , G11B5/012
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.

2. 发明授权

US11508403B1 Reducing the effect of actuator cross-coupling in split actuator drives 有权
公开(公告)号：US11508403B1
公开(公告)日：2022-11-22
申请号：US17357799
申请日：2021-06-24
申请人： KABUSHIKI KAISHA TOSHIBA , TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
发明人： Gabor Szita , Anton Gerasimov , Jiangang Liang , Gary W. Calfee
IPC分类号： G11B5/596 , G11B5/55 , G11B19/20
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.

3. 发明授权

US11227631B2 Parallel micro-actuator SSW writing 有权
公开(公告)号：US11227631B2
公开(公告)日：2022-01-18
申请号：US16882956
申请日：2020-05-26
申请人： KABUSHIKI KAISHA TOSHIBA , TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
发明人： Thorsten Schmidt , Gary W. Calfee , Gabor Szita , Hieu Pham
IPC分类号： G11B5/09 , G11B5/596 , G11B5/55 , G11B5/29
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.

4. 发明授权

US11205450B2 Split-actuator disk drive that uses microactuator feedforward to reduce effects of cross-actuator coupling 有权
公开(公告)号：US11205450B2
公开(公告)日：2021-12-21
申请号：US16879690
申请日：2020-05-20
申请人： KABUSHIKI KAISHA TOSHIBA , TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
发明人： Gary W. Calfee , Richard M. Ehrlich , Thorsten Schmidt , Gabor Szita
IPC分类号： G11B5/596 , G11B5/48
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.

5. 发明授权

US11189310B1 Split-actuator disk drive that uses microactuator feedforward to reduce effects of cross-actuator coupling 有权
公开(公告)号：US11189310B1
公开(公告)日：2021-11-30
申请号：US16879694
申请日：2020-05-29
申请人： KABUSHIKI KAISHA TOSHIBA , TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
发明人： Gary W. Calfee , Richard M. Ehrlich , Thorsten Schmidt , Gabor Szita
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.

6. 发明授权

US10665257B2 Parallel micro-actuator SSW writing 有权
公开(公告)号：US10665257B2
公开(公告)日：2020-05-26
申请号：US15919123
申请日：2018-03-12
申请人： KABUSHIKI KAISHA TOSHIBA , Toshiba Electronic Devices & Storage Corporation
发明人： Thorsten Schmidt , Gary W. Calfee , Gabor Szita , Hieu Pham
IPC分类号： G11B5/09 , G11B5/596 , G11B5/55 , G11B5/29
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.

7. 发明授权

US09640210B1 Virtual window mode for guide spiral servo demodulation 有权
公开(公告)号：US09640210B1
公开(公告)日：2017-05-02
申请号：US14941375
申请日：2015-11-13
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Jiangang Liang , Gabor Szita
IPC分类号： G11B5/596
CPC分类号： G11B5/59688 , G11B5/59661 , G11B5/59666
摘要： A write head is positioned over a disk surface of a hard disk drive during a self-servo write process. A virtual window mode is employed for positioning the write head, in which the read channel of the hard disk drive continuously searches for servo spirals, but spiral detection is disabled except during specific time intervals, or “virtual windows.” Each virtual window is associated with one specific servo spiral on the disk surface, and has a predetermined duration. The duration and timing of these virtual windows may be selected to ensure that spiral detection is enabled while a read head of the hard disk drive passes over the associated servo spiral, even when servo spiral placement is not ideal.

8. 发明授权

US09514774B1 Spiral pitch correction based on micro-jog variation 有权
标题翻译：基于微动差变化的螺旋音调校正
公开(公告)号：US09514774B1
公开(公告)日：2016-12-06
申请号：US14924630
申请日：2015-10-27
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Gabor Szita , Jiangang Liang , Anton Gerasimov
IPC分类号： G11B21/02 , G11B5/596 , G11B5/012 , G11B20/12
CPC分类号： G11B5/59666 , G11B5/012 , G11B5/59661 , G11B5/59672 , G11B5/59688 , G11B20/10009 , G11B2020/1281
摘要： During a self-servo write process, servo sectors that have uniform radial spacing are written on a disk surface. As part of the in-drive writing of the servo sectors, a radial offset between a reader element and a writer element of a magnetic head is measured. The measured radial offset, or micro-jog, is compared to a known nominal micro-jog value for the current radial position of the magnetic head. When the measured micro-jog value does not match the nominal micro-jog value, an appropriate correction to the self-servo write step size is applied to the radial spacing between the servo sectors being written. Variations from ideal servo spiral slope that are inherent in some servo spirals can be compensated for, thereby improving the uniformity of radial spacing of data tracks associated with the servo sectors.
摘要翻译：在自伺服写入过程中，具有均匀径向间隔的伺服扇区写在磁盘表面上。作为伺服扇区的驱动写入的一部分，测量读取器元件和磁头的写入器元件之间的径向偏移。将测量的径向偏移或微点动作与磁头的当前径向位置的已知标称微点动值进行比较。当测量的微步进值不符合标称微点动值时，对自动伺服写入步长的适当校正被应用于被写入的伺服扇区之间的径向间隔。可以补偿一些伺服螺旋固有的理想伺服螺旋斜率的变化，从而提高与伺服扇区相关的数据轨迹的径向间隔的均匀性。

9. 发明授权

US09947356B1 Calibration spiral to improve guide spiral placement 有权
公开(公告)号：US09947356B1
公开(公告)日：2018-04-17
申请号：US15454886
申请日：2017-03-09
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Richard Oswald , Gabor Szita , Li Zhang
IPC分类号： G11B5/09 , G11B5/596
CPC分类号： G11B5/59661 , G11B5/59666
摘要： A method of writing servo spirals for spiral-based self-servo writing includes determining control parameters for controlling movement of a write head between a first and a second disk radial location at a first velocity, writing a first spiral while controlling the movement of the write head between the first and the second disk radial location at the first velocity according to the determined control parameters, writing a second spiral while controlling movement of the write head between the first and the second disk radial location at a second velocity that is different from the first velocity, based on timing and location information from the first spiral, and writing a third spiral while controlling movement of the write head between the first and the second disk radial location at the first velocity according to the determined control parameters and based on timing and location information from the second spiral.

10. 发明授权

US09691421B2 Writing spirals with accurate slope on a disk drive media 有权
公开(公告)号：US09691421B2
公开(公告)日：2017-06-27
申请号：US14675458
申请日：2015-03-31
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Gabor Szita , Jiangang Liang , Li Zhang , Gary W. Calfee
IPC分类号： G11B5/596 , G11B5/55
CPC分类号： G11B5/59666 , G11B5/5543 , G11B5/59661
摘要： A reference spiral is written on a recording surface of a magnetic storage disk that is free of position or timing information. The reference spirals are written on the recording surface with a substantially uniform slope by using open loop control of the position of a read/write head in conjunction with an iterative learning control scheme. A voltage profile applied to a voice coil motor is adapted over multiple iterations of moving the read/write head across the recording surface to closely approximate a target voltage profile, and the reference spiral is written using the adapted voltage profile. In addition, ramp contact detection based on actuator current profile may be employed to achieve full utilization of available actuator stroke.

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