Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Assigned Fourteen Patents

Magnetic disk device and reference pattern writing method of same preliminary class
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corp., Tokyo, Japan, has been assigned a patent (12094505) developed by Tani; Hiroshi, Kawasaki Kanagawa, Japan, and Takaishi; Kazuhiko, Machida Tokyo, Japan, for “magnetic disk device and reference pattern writing method of the same preliminary class.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk device writes a plurality of simulated reference patterns to the magnetic disk on write conditions different from each other, detects a write state of each of the simulated reference patterns, selects one of the write conditions according to detection results, and writes a plurality of regular reference patterns which become criteria for predetermined processing to be executed on the magnetic disk to the magnetic disk on the selected write condition.”

The patent application was filed on 2023-03-13 (18/182586).

Magnetic disk device and method
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage, Tokyo, Japan, Corporation, has been assigned a patent (12087326) developed by Hasegawa; Hitoshi, Kawasaki Kanagawa, Japan, and Takeda; Hiroyuki, Tokyo, Japan, for “magnetic disk device and method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to an embodiment, upon a failure in detection of a servo mark from servo data recorded in a first normal servo sector in a write operation, a controller of a magnetic disk device stops a write operation. Then, the controller demodulates the servo data including the servo mark, for the servo data recorded in a first short servo sector being a short servo sector immediately before the first normal servo sector, and resumes the write operation from a data area immediately after the first normal servo sector.”

The patent application was filed on 2023-09-06 (18/242712).

Magnetic disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage, Tokyo, Japan, Corporation, has been assigned a patent (12080321) developed by Miyamoto; Koichiro, Oozeki; Kenichiro, Yokohama Kanagawa, Japan, and Chen; Yu, Sagamihara Kanagawa, Japan, for a “magnetic disk device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk device includes a magnetic disk, a magnetic head, an actuator, a controller, and a ramp. The magnetic head is configured to record data on and reproduce data from the magnetic disk. The actuator is configured to move the magnetic head relative to the magnetic disk. The controller is configured to control the actuator. The ramp is configured to hold the magnetic head. The controller is configured to, in a retract operation for causing the actuator to retract the magnetic head to the ramp, alternate detection of a back electromotive force of the actuator and application of a voltage corresponding to the back electromotive force to the actuator, and skip the detection of the back electromotive force a predetermined number of times in response to an event that the magnetic head moves at a speed outside a predetermined range.”

The patent application was filed on 2022-09-12 (17/942943).

Magnetic disk device and method
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage, Tokyo, Japan, Corporation, has been assigned a patent (12080326) developed by Tashiro; Tomonari, Yokohama Kanagawa, Japan, for “magnetic disk device and method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to an embodiment, a magnetic disk device includes a first component and a second component. The first component operates at a voltage of a first value. The second component is connected to the first component by a power line for transmitting power to the first component, and operates at a voltage of a second value. In response to supply of the voltage of the second value, the second component outputs a voltage of a third value smaller than the first value to the power line and measures a fourth value, which is a value of current flowing through the power line. The second component starts output of the voltage of the first value to the power line when the fourth value is smaller than the first threshold, and stops output of the voltage to the power line when the fourth value is larger than the first threshold.”

The patent application was filed on 2023-03-10 (18/181859).

Magnetic disk device and control method
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage, Tokyo, Japan, Corporation, has been assigned a patent (12073855) developed by Sudo; Daisuke, Kawasaki Kanagawa, Japan, for “magnetic disk device and control method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk device includes a magnetic disk, a motor, a magnetic head, and a controller. A first area, and a second area located on an inner diameter side of the first area are provided in the magnetic disk. The motor rotates the magnetic disk. The controller receives a write command. In a case where a first position that is a position designated as a write destination of data by the write command is included in the first area, the controller writes the data to the first position by the magnetic head while rotating the magnetic disk at a rotational speed of a first value. In a case where the first position is included in the second area, the controller writes the data to the first position by the magnetic head while rotating the magnetic disk at a rotational speed of a second value larger than the first value.”

The patent application was filed on 2023-02-15 (18/169629).

Magnetic disk device and method
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage, Tokyo, Japan, Corporation, has been assigned a patent (12051451) developed by Yamamoto; Yu, Meguro Tokyo, Japan, and Abe; Takao, Yokohama Kanagawa, Japan, for “magnetic disk device and method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to embodiments, a magnetic disk device includes a magnetic disk, a magnetic head, and a controller. In the magnetic disk, a plurality of servo sectors is arranged in a circumferential direction. Servo information including a post code indicating a repeatable runout (RRO) correction amount is written to each of the plurality of servo sectors. The magnetic head writes and reads data to and from the magnetic disk. In positioning control for the magnetic head, when a read error of a first post code continuously occurs, the controller uses a first RRO correction value, which is different from a second RRO correction value based on the RRO correction value indicated by the first post code. The first post code is a post code of a first servo sector, which is one of the plurality of servo sectors.”

The patent application was filed on 2023-03-03 (18/178128).

Magnetic disk device and method
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage, Tokyo, Japan, Corporation, has been assigned a patent (12051452) developed by Tagami; Naoki, Yokohama Kanagawa, Japan, for “magnetic disk device and method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to an embodiment, a magnetic disk is provided with a servo sector in which a preamble and a burst pattern are recorded. A recording frequency of the preamble is different from an even multiple of a recording frequency of the burst pattern. A controller determines a demodulation period of the burst pattern while a magnetic head passes through the servo sector. The controller acquires a first phase of a demodulation signal of the burst pattern and acquires first position information of the magnetic head, by demodulating the burst pattern in the demodulation period. The controller corrects the first position information on the basis of the first phase. The controller executes positioning control of the magnetic head on the basis of second position information that is post-correction first position information.”

The patent application was filed on 2023-09-06 (18/243069).

Magnetic disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage, Tokyo, Japan, Corporation, has been assigned a patent (12046264) developed by Sudo; Daisuke, Kawasaki Kanagawa, Japan, for a “magnetic disk device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk device comprises a JIT seek control unit, which uses second time series data of a current indication value of a VCM that sets a slope having an absolute value smaller than an absolute value of a slope of a first time series data in at least one of a monotonically decreasing interval of an acceleration interval and a monotonically decreasing interval of a deceleration interval of a head or an operation acceleration of the head.”

The patent application was filed on 2023-03-15 (18/184399).

Magnetic disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage, Tokyo, Japan, Corporation, has been assigned a patent (12033662) developed by Furuhashi; Kana, Kawasaki Kanagawa, Japan, and Takeda; Hiroyuki, Tokyo, Japan, for a “magnetic disk device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic disk device includes a disk including a plurality of error sectors including a defect, a first track having a first parity sector, and a controller. The controller is configured to, upon receiving a write command to write first data in a first region of a portion of the first track, which is a portion of the first track, first perform an XOR operation on all sectors of the first track other than one or more sectors of the first region and the first parity sector of the first track, and then write the first data in the one or more sectors of the first region, perform a second XOR operation on the one or more sectors of the first region and the result of the first XOR operation, and write the result of the second XOR operation in the first parity sector.”

The patent application was filed on 2021-08-31 (17/462379).

Magnetic disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage, Tokyo, Japan, Corporation, has been assigned a patent (12027189) developed by Furuhashi; Takao, Kawasaki Kanagawa, Japan, for a “magnetic disk device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk device includes a magnetic disk, a magnetic head including a write head which writes data to the magnetic disk, a read head which reads data from the magnetic disk, a first heater which adjusts a flying height of the write head, a second heater which adjusts a flying height of the read head and a controller which controls powers supplied to the first heater and the second heat, and controls a power value of the power supplied to the first heater according to a ratio between an electric resistance value of the first heater and an electric resistance value of the second heater.”

The patent application was filed on 2023-03-09 (18/119636).

Disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage, Tokyo, Japan, Corporation, has been assigned a patent (12027188) developed by Ogawa; Takuya, Tokyo, Japan, and Tsukahara; Wataru, Yokohama Kanagawa, Japan, for a “disk device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, in a disk device, a controller adjusts a correction value of a radial position of servo track according to a ratio between amplitude of a correction value spectrum of a radial position of the servo track at a first circumferential position and at a second circumferential position when positioning control of the head to a target data track is performed on a basis of servo information read from the servo track. At the first circumferential position, a relative speed of a change in the radial position of the servo track with respect to a radial position of the target data track becomes a first speed. At the second circumferential position, a relative speed of a change in the radial position of the servo track with respect to the radial position of the target data track becomes a second speed.”

The patent application was filed on 2023-03-07 (18/180013).

Magnetic disk device and control method
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage, Tokyo, Japan, Corporation, has been assigned a patent (12027180) developed by Uchida; Takato, Hiratsuka Kanagawa, Japan, for “magnetic disk device and control method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic disk device according to one embodiment includes a magnetic disk on which multiple tracks are provided, a magnetic head, and a controller. At least one of the multiple tracks includes first sectors and a second sector. Each of the first sectors stores data segments. The second sector stores a parity for error correction. The magnetic head executes writing/reading to/from the magnetic disk. The controller executes processing of adjusting a guaranteed number of times by using a second sector being invalid. The guaranteed number of times indicates a number of times of writing for guaranteeing reading from an adjacent track.”

The patent application was filed on 2023-08-22 (18/236910).

Magnetic disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage, Tokyo, Japan, Corporation, has been assigned a patent (12014757) developed by Kobatake; Shinichi, Yokohama Kanagawa, Japan, Watanabe; Toru, and Yamane; Masami, Kawasaki Kanagawa, Japan, for a “magnetic disk device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “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)<(Vrs/Vts).”

The patent application was filed on 2023-02-15 (18/169407).

Magnetic disk device and method of adjusting preheat time
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage, Tokyo, Japan, Corporation, has been assigned a patent (12002495) developed by Isokawa; Hiroshi, Yokohama Kanagawa, Japan, and Matsumoto; Takuya, Kawasaki Kanagawa, Japan, for “magnetic disk device and method of adjusting preheat time.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk device includes magnetic disks, a plurality of magnetic heads, and a control unit. A plurality of magnetic heads each includes a heat-assist unit which applies a preheating current of such magnitude that data already written to the magnetic disk is not erased to a near-field optical element for the preheat time. The control unit measures the time elapsing from a start of write to the time when a value of an index indicating the quality of a recording signal of data written by the magnetic head converges to within a first threshold range, and adjusts the preheat time for each of the magnetic heads in such a manner that the measured lapse time becomes less than or equal to a second threshold.”

The patent application was filed on 2023-03-09 (18/119730).