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1.
公开(公告)号:US20240363142A1
公开(公告)日:2024-10-31
申请号:US18768256
申请日:2024-07-10
申请人: FUJIFILM Corporation
发明人: Toru NAKAO , Tetsuya KANEKO , Yoichi AKANO
CPC分类号: G11B5/5508 , G11B5/5928
摘要: A magnetic head includes a first servo reading element pair, a second servo reading element pair, and a plurality of magnetic elements. The first servo reading element pair consists of a first servo reading element and a second servo reading element, the second servo reading element pair consists of a third servo reading element and a fourth servo reading element, the first servo reading element and the third servo reading element are disposed on one end side of the plurality of magnetic elements and read one servo band of the pair of servo bands, and the second servo reading element and the fourth servo reading element are disposed on the other end side of the plurality of magnetic elements and read the other servo band of the pair of servo bands.
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公开(公告)号:US20240321292A1
公开(公告)日:2024-09-26
申请号:US18461944
申请日:2023-09-06
发明人: Yuki SATO
CPC分类号: G11B5/012 , G11B5/02 , G11B5/105 , G11B5/4853 , G11B5/5534
摘要: According to one embodiment, a disk device includes a magnetic disk, a magnetic head, a suspension, a ramp mechanism, a housing, and a screw. The suspension holds the magnetic head and moves between a load position and an unload position. The ramp mechanism includes a ramp member that holds the suspension at the unload position, and a cylindrical member with a through hole, being fixed to the ramp member. The housing includes a first support surface with a screw hole supporting the cylindrical member. The screw includes a screw head and a screw shaft fitted into the screw hole through the through hole. The screw holds the cylindrical member between the screw head and the first support surface. A contact area between the cylindrical member and the housing is set to larger than a contact area between the cylindrical member and the screw head.
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公开(公告)号:US20240304217A1
公开(公告)日:2024-09-12
申请号:US18367716
申请日:2023-09-13
发明人: Satoshi SHIBATA
IPC分类号: G11B7/24097 , G11B5/55 , G11B23/00
CPC分类号: G11B7/24097 , G11B5/556 , G11B23/0042 , G11B21/083
摘要: According to one embodiment, a production pallet control system comprises a plurality of magnetic disk devices configured to execute a plurality of processes, and the magnetic disk devices configured to output status information related to the process based on a requires from the outside and a controller connected to the magnetic disk devices in a mutually communicable manner, the controller configured to inquire the status information of each of the magnetic disk devices.
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公开(公告)号:US12087335B2
公开(公告)日:2024-09-10
申请号:US18224398
申请日:2023-07-20
发明人: Brandon Kaplan
CPC分类号: G11B5/4806 , G11B5/5573 , G11B21/02 , H02K15/00 , H02K41/0354
摘要: A process of assembling a voice coil motor (VCM), such as for a hard disk drive, includes creating an opening in a yoke, attaching a primary magnet to an inside surface of the yoke, installing through the opening in the yoke a cross-flux magnet into a channel of the primary magnet, and installing a plug into the opening in the yoke. Thus, part count is minimized and the manufacturing process is readily incorporated into existing VCM manufacturing processes.
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公开(公告)号:US12014757B2
公开(公告)日:2024-06-18
申请号:US18169407
申请日:2023-02-15
发明人: Shinichi Kobatake , Toru Watanabe , Masami Yamane
CPC分类号: G11B5/5547 , G11B5/012 , G11B19/28
摘要: According to one embodiment, a disk device includes a rotatable magnetic disk, an actuator which supports and moves a head, a ramp which holds the head at an unloaded position, a motor which rotates the magnetic disk, and a controller which performs a load operation and a seek operation. When a radial travel speed of the head during the load operation is referred to as Vr1, a circumferential travel speed of the head is referred to as Vt1, a radial travel speed of the head during the seek operation is referred to as Vrs, and a circumferential travel speed is referred to as Vts, the controller controls at least one of the radial travel speed of the head and number of revolutions of the magnetic disk to satisfy a relationship (Vr1/Vt1)
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公开(公告)号:US11955146B2
公开(公告)日:2024-04-09
申请号:US18179824
申请日:2023-03-07
发明人: Naoki Tagami
CPC分类号: G11B5/012 , G11B5/02 , G11B5/1878 , G11B5/5526 , G11B5/59638 , G11B5/59655
摘要: According to one embodiment, in a magnetic disk, a plurality of first servo sectors is arranged at intervals in the circumferential direction. Each of the plurality of first servo sectors includes a first area and a second area. First information including a preamble, a servo mark, and a Gray code is written in the first area. The second area is disposed after the first area in a write and read direction along the circumferential direction, and second information including a burst pattern is written in the second area. The plurality of first servo sectors includes a plurality of second servo sectors and a plurality of third servo sectors. The circumferential length of a first area included in each of the plurality of third servo sectors is longer than the circumferential length of a first area included in each of the plurality of second servo sectors.
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公开(公告)号:US11942110B2
公开(公告)日:2024-03-26
申请号:US18119749
申请日:2023-03-09
发明人: Takashi Fujinami , Noriyuki Satou , Takashi Onoda
CPC分类号: G11B19/02
摘要: According to one embodiment, a magnetic disk device includes a disk, a head, a command queue, a command residence time calculation unit calculating a residence time of each of commands in the command queue, a command information calculation unit calculating the number of the commands and a ratio, a limit time determination unit obtaining a latency limit time corresponding to the number of commands and the ratio, from a latency limit time determination table, and a command selection processing unit selecting a command to be executed, by considering the latency limit time.
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8.
公开(公告)号:US20230417605A1
公开(公告)日:2023-12-28
申请号:US18340033
申请日:2023-06-23
申请人: NHK SPRING CO., LTD.
发明人: Takeshi SHIMODA
CPC分类号: G01K7/02 , G11B5/5565 , G01K1/14
摘要: A temperature measuring unit includes a base including a first face, a second face on a side opposite to the first face, and a first opening portion penetrating the first face and the second face, a support member including a body portion provided on the second face side to overlap with the first opening portion, and a plurality of extending portions extending from the body portion along the second face and overlapping with the second face, and a thermocouple inserted into the first opening portion and including a measuring portion located on the body portion.
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9.
公开(公告)号:US20230386513A1
公开(公告)日:2023-11-30
申请号:US18446637
申请日:2023-08-09
发明人: Brian Johnson , Jaesoo Byoun , Gaku Ikedo , Hideaki Ito , Naoyuki Kagami , Hiroki Watanabe
CPC分类号: G11B5/5578 , G11B5/4813 , G11B5/5573
摘要: A data storage device comprises a lead actuator that actuates a first read-write head over a first disk and a support actuator that actuates a second read-write head over a second disk. A spindle motor rotates the first and second disks. In response to an emergency power off (EPO) event, a processing device retracts and parks the actuators using an internal supply voltage generated from a back electromotive force (BEMF) voltage of the spindle motor, and brakes the spindle motor. The spindle motor is not braked until both the lead and support actuators have been retracted and parked.
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公开(公告)号:US11817136B2
公开(公告)日:2023-11-14
申请号:US17892917
申请日:2022-08-22
发明人: Takeyori Hara
CPC分类号: G11B5/5582 , G11B5/5547 , G11B5/5578
摘要: According to an embodiment, in a disk device, a first actuator moves a first head with respect to a first surface of a first disk. A controller controls positioning of the first head via the first actuator and controls a write operation to the first disk by the first head. The controller acquires information regarding a state of a vibration source, changes a value of a coefficient for estimating a predicted position of the first head according to the information regarding the state of the vibration source, estimates a predicted position of the first head with the value of the coefficient changed, performs a write operation by the first head in a case where the predicted position estimated is equal to or less than a threshold, and prohibits the write operation by the first head in a case where the predicted position estimated exceeds the threshold.
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