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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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公开(公告)号：US20210398561A1
公开(公告)日：2021-12-23
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：US20210335389A1
公开(公告)日：2021-10-28
申请号：US17305414
申请日：2021-07-07
申请人： SHOWA DENKO K.K.
发明人： Yoshihito SUEOKA , Masato FUKUSHIMA
摘要： A storage apparatus includes a disk-shaped recording medium having a surface, a motor configured to drive and rotate the recording medium, a head configured to read information from and write information to the recording medium, a ramp mechanism configured to move the head from a position above the surface of the recording medium to a head receded position, and a ramp retracting mechanism configured to move the ramp mechanism from a position above the surface of the recording medium to a ramp retracted position. Each of the head receded position and the ramp retracted position is outside a range of the recording medium in a plan view viewed from above the recording medium in a direction perpendicular to the surface of the recording medium.
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公开(公告)号：US20210272597A1
公开(公告)日：2021-09-02
申请号：US16944599
申请日：2020-07-31
发明人： Mio Okada , Toru Watanabe , Gaku Koizumi , Yusuke Tomoda
摘要： According to one embodiment, a magnetic disk device includes a magnetic disk, a magnetic head including an assist part to assist recording of data into the magnetic disk, a controller configured to control the recording of data by the magnetic head based on a recording condition, and a memory configured to record a first threshold value used to define that an assist element included in the assist part is in a deterioration condition. Furthermore, the controller detects the condition of the assist element, determines whether or not the recording condition is changed based on the detected condition and the first threshold value stored in the memory, and changes the recording condition based on the result of the determination.
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公开(公告)号：US11100952B2
公开(公告)日：2021-08-24
申请号：US17095934
申请日：2020-11-12
申请人： SHOWA DENKO K.K.
发明人： Yoshihito Sueoka , Masato Fukushima
摘要： A storage apparatus includes a disk-shaped recording medium having a surface, a motor configured to drive and rotate the recording medium, a head configured to read information from and write information to the recording medium, a ramp mechanism configured to move the head from a position above the surface of the recording medium to a head receded position, and a ramp retracting mechanism configured to move the ramp mechanism from a position above the surface of the recording medium to a ramp retracted position. Each of the head receded position and the ramp retracted position is outside a range of the recording medium in a plan view viewed from above the recording medium in a direction perpendicular to the surface of the recording medium.
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公开(公告)号：US10685678B2
公开(公告)日：2020-06-16
申请号：US16583815
申请日：2019-09-26
发明人： Richard M. Ehrlich
摘要： A dual-stage servo system of a disk drive includes a first fine positioning servo system with a first microactuator that independently controls the position of a first read/write head over a first recording surface and a second fine positioning servo system with a second microactuator that independently controls the position of a second read/write head over a second recording surface. The first microactuator accesses a first data stripe while the second fine positioning servo system simultaneously accesses a second data stripe. Data can be transferred to or from the first and second data stripes simultaneously.
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公开(公告)号：US20200126592A1
公开(公告)日：2020-04-23
申请号：US16583815
申请日：2019-09-26
发明人： Richard M. EHRLICH
摘要： A dual-stage servo system of a disk drive includes a first fine positioning servo system with a first microactuator that independently controls the position of a first read/write head over a first recording surface and a second fine positioning servo system with a second microactuator that independently controls the position of a second read/write head over a second recording surface. The first microactuator accesses a first data stripe while the second fine positioning servo system simultaneously accesses a second data stripe. Data can be transferred to or from the first and second data stripes simultaneously.
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