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公开(公告)号：US11960760B2
公开(公告)日：2024-04-16
申请号：US18317836
申请日：2023-05-15
IPC分类号： G06F3/06
CPC分类号： G06F3/0655 , G06F3/0604 , G06F3/0676
摘要： Systems and methods for scheduling the execution of disk access commands in a split-actuator hard disk drive are provided. In some embodiments, while a first actuator of the split actuator is in the process of performing a first disk access command (a victim operation), a second disk access command (an aggressor operation) is selected for and executed by a second actuator of the split actuator. The aggressor operation is selected from a queue of disk access commands for the second actuator, and is selected based on being the disk access command in the queue that can be initiated sooner than any other disk access command in the queue without disturbing the victim operation.
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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：US11036436B2
公开(公告)日：2021-06-15
申请号：US16589098
申请日：2019-09-30
IPC分类号： G06F3/06
摘要： Systems and methods for scheduling the execution of disk access commands in a split-actuator hard disk drive are provided. In some embodiments, while a first actuator of the split actuator is in the process of performing a first disk access command (a victim operation), a second disk access command (an aggressor operation) is selected for and executed by a second actuator of the split actuator. The aggressor operation is selected from a queue of disk access commands for the second actuator, and is selected based on being the disk access command in the queue that can be initiated sooner than any other disk access command in the queue without disturbing the victim operation.
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公开(公告)号：US20210096769A1
公开(公告)日：2021-04-01
申请号：US16589098
申请日：2019-09-30
IPC分类号： G06F3/06
摘要： Systems and methods for scheduling the execution of disk access commands in a split-actuator hard disk drive are provided. In some embodiments, while a first actuator of the split actuator is in the process of performing a first disk access command (a victim operation), a second disk access command (an aggressor operation) is selected for and executed by a second actuator of the split actuator. The aggressor operation is selected from a queue of disk access commands for the second actuator, and is selected based on being the disk access command in the queue that can be initiated sooner than any other disk access command in the queue without disturbing the victim operation.
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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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公开(公告)号：US09691421B2
公开(公告)日：2017-06-27
申请号：US14675458
申请日：2015-03-31
发明人： Gabor Szita , Jiangang Liang , Li Zhang , Gary W. Calfee
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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公开(公告)号：US09311941B1
公开(公告)日：2016-04-12
申请号：US14675507
申请日：2015-03-31
CPC分类号： G11B5/59638 , G11B5/024 , G11B5/03 , G11B5/59627 , G11B5/59683 , G11B20/1217 , G11B2020/10851 , G11B2020/1281
摘要： In an in-drive erase process for erasing disk surfaces of a hard disk drive, erase spirals are written on multiple disk surfaces and at a different write frequency than that of other data patterns on the disk surfaces. The erase spirals written on a first disk surface can be used to control an erase process on a portion of the remaining disk surfaces. Erase spirals are then written on a different disk surface and can then be used to erase all data on the first disk surface. Consequently, even when every disk surface includes previously written data patterns that can potentially interfere with control of the erase process, the erase spirals so written can control the erase process with sufficient precision to thoroughly erase each disk surface.
摘要翻译： 在擦除硬盘驱动器的磁盘表面的驱动器内擦除过程中，擦除螺旋写在多个磁盘表面上，写入频率与磁盘表面上的其他数据模式不同。 写在第一磁盘表面上的擦除螺旋可用于控制剩余磁盘表面的一部分上的擦除过程。 然后将擦除螺旋写在不同的磁盘表面上，然后可以用于擦除第一个磁盘表面上的所有数据。 因此，即使当每个盘表面包括可能潜在地干扰擦除处理的控制的先前写入的数据模式时，如此写入的擦除螺旋可以以足够的精度来控制擦除处理以彻底擦除每个盘表面。
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