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公开(公告)号：US11978483B2
公开(公告)日：2024-05-07
申请号：US17931679
申请日：2022-09-13
发明人： Wataru Tsukahara
CPC分类号： G11B21/083
摘要： According to embodiments, a magnetic disk apparatus includes a magnetic disk, a magnetic head, a temperature sensor, and a controller. The magnetic disk has formed therein a servo sector in which servo data including a first post code and a second post code is recorded. In the positioning of the magnetic head, the controller performs a correction using a third post code that is based on the first and second post codes and a first temperature detected by the temperature sensor.
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公开(公告)号：US11948603B1
公开(公告)日：2024-04-02
申请号：US17945187
申请日：2022-09-15
发明人： Brian Johnson , Jaesoo Byoun , Gaku Ikedo , Hideaki Ito , Naoyuki Kagami , Yasunori Fukuyama
CPC分类号： G11B21/08
摘要： Various illustrative aspects are directed to a data storage device comprising one or more disks, an actuator arm assembly comprising a voice coil motor (VCM), the VCM configured to operate in a first mode and a second, different mode, wherein the first mode corresponds to at least a first and a second setting, and a control circuitry configured to cause the VCM to seek towards a target track in the first mode using the first setting for a first duration, control transition of the VCM from the first to the second setting in the first mode, cause the VCM to seek towards the target track using the second setting for a second duration, and control transition of the VCM from the first to a second mode, wherein controlling the transitioning comprises seeking the VCM toward the target track in the second mode for a third duration.
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公开(公告)号：US11875821B2
公开(公告)日：2024-01-16
申请号：US17900473
申请日：2022-08-31
发明人： Masafumi Iwashiro
摘要： A disk device includes a first controller configured to determine a first operation amount of a first actuator based on a difference between a current position and a target position of a head, a second controller configured to determine a second operation amount of a second actuator based on the difference, and a processor. The processor is configured to perform a first filtering to calculate a first filter value based on a vibration detected at multiple points in time and filter coefficients, perform a second filtering to generate a second filter value based on the vibration detected at each of the multiple points in time, and update the filter coefficients based on the second filter values and a difference between the target position and an updated position of the head.
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公开(公告)号：US20240005959A1
公开(公告)日：2024-01-04
申请号：US17853266
申请日：2022-06-29
摘要： Example control circuitry, data storage devices, and methods to provide a spiral data track format that is different from the underlying servo track format are described. The data storage device may include a storage medium configured with a plurality of tracks in at least one continuous spiral pattern and a head actuated over the storage medium. The data tracks may be written to the storage medium with track lengths that are different than a single revolution of the storage medium.
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公开(公告)号：US11830524B1
公开(公告)日：2023-11-28
申请号：US17839011
申请日：2022-06-13
发明人： Kei Yasuna , Guoxiao Guo , Ichiro Yokokawa
CPC分类号： G11B21/08
摘要： Various illustrative aspects are directed to a data storage device, comprising: one or more disks; an actuating mechanism comprising one or more heads, and configured to position the one or more heads proximate to disk surfaces of the one or more disks; and one or more processing devices. The one or more processing devices are configured to: determine a first burst value based on an averaged value of a first set of one or more bursts; determine a second burst value based on an averaged value of a second set of one or more bursts; generate a position error signal (PES) based on the determined first burst value and the determined second burst value; and control a position of at least one head among the one or more heads based on the PES.
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公开(公告)号：US11817125B1
公开(公告)日：2023-11-14
申请号：US17820544
申请日：2022-08-17
CPC分类号： G11B21/08
摘要： A brake crawler assembly configured for vertically moving an arm assembly along a pivot member in a multi-disk hard disk drive is provided. The brake crawler assembly includes a first clamp, including a first recess within which is disposed a first actuator and a first clamp calibration element. The first clamp calibration element includes a first clamp calibration access portion adapted to be accessible externally of the first clamp and adapted to receive a first external adjustment and a first clamp internal compression modifier adapted to modify a force exerted by the first actuator on the first recess, responsive to the received first external adjustment, wherein the first clamp is configured to selectively engage the pivot member at a position along the pivot member relative to at least one disk of the multi-disk hard disk drive based on the modified force exerted.
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公开(公告)号：US11600298B2
公开(公告)日：2023-03-07
申请号：US17514921
申请日：2021-10-29
发明人： Yasuhiko Kato
摘要： According to one embodiment, a disk device includes a recording medium, a magnetic head, a ramp, and an actuator. The recording medium has a recording surface and is rotatable around a first rotation axis. The actuator includes a first portion extending so as to be separated from a second rotation axis and separated from the recording surface as the distance from the second rotation axis increases, holds the magnetic head, and is rotatable around the second rotation axis. A first support is provided on the ramp, extends around the second rotation axis, and can support the first portion so that the magnetic head is separated from the recording surface. A second support is provided on the ramp, is located between the first rotation axis and the first support, is separated from the second rotation axis farther than the first support, and can support the first portion.
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公开(公告)号：US20220290066A1
公开(公告)日：2022-09-15
申请号：US17193954
申请日：2021-03-05
发明人： Xingliang He , Bala Krishna Pathem
IPC分类号： C10M107/38 , C08G65/26 , G11B5/012 , G11B21/08 , G11B5/48
摘要： Low-profile thermally stable lubricants for data storage devices are provided based on multi-dentate molecular designs. One such lubricant comprises perfluoroalkyl ether segments, a divalent linking segment, and anchoring functional groups attachable to, or engageable with, a protective overcoat of a magnetic recording medium. The lubricants can be used in conjunction with a magnetic recording medium and/or a magnetic data storage system.
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公开(公告)号：US11322181B2
公开(公告)日：2022-05-03
申请号：US17174459
申请日：2021-02-12
发明人： Nobuhiro Maeto
摘要： According to one embodiment, a magnetic disk device includes a disk, a head including a write head and a first read head and a second read head, and a controller that disposes the first read head at a first radial position of a first track of the disk in a radial direction to read the first track, changes a main read head which serves as a reference for positioning during a read process from the first read head to the second read head when read retrying the first track, disposes the second read head as the main read head at a second radial position different from the first radial position of the first track in the radial direction to read the first track, and changes an internal setting corresponding to the main read head to read the first track.
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公开(公告)号：US20220076703A1
公开(公告)日：2022-03-10
申请号：US17447209
申请日：2021-09-09
发明人： Supaket Katchmart
摘要： A self-servo-write (SSW) method in a storage device includes detecting, with a first read head, SSW spiral signals from a first track on a first storage medium surface, processing the SSW spiral signals from the first track using a first read channel, to generate first control signals for positioning the first read head relative to the first track, detecting, with a second read head, SSW spiral signals from a second track on a second storage medium surface, processing the SSW spiral signals from the second track using a second read channel, to generate second control signals for positioning the second read head relative to the second track, positioning a first write head relative to the first track using the first control signals via a single write channel, and positioning a second write head relative to the second track using the second control signals via the single write channel.
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