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

On HDD technologies and solutions

Magnetic disk apparatus and method
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11899968) developed by Miyake, Masahisa, Ome Tokyo, Japan,and Takada, Kazuya, Chigasaki Kanagawa, Japan, for magnetic disk apparatus and method.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk apparatus is provided with a magnetic disk, a buffer memory, and a control circuit. The magnetic disk has plural bands, each of which is a storage area in which data is written by the method of SMR. The control circuit receives a read request from outside. If the data requested to be read is first data of an update target stored in a first band among plural bands, the control circuit reads the first data from the first band, stores the first data in a buffer memory, and updates the first data in the buffer memory. Then, the control circuit transmits the first data in the buffer memory to the outside and writes the first data in the buffer memory to one of the plural bands.

The patent application was filed on 2022-03-08 (17/689242).

Disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11900964) developed by Okubo, Tomokazu, Kawasaki Kanagawa, Japan, for a disk device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to an embodiment, there is provided a disk device including a disk, a head, a preamplifier and a controller. The head writes information to the disk according to a write current. The preamplifier causes the write current to flow through the head. The controller is capable of causing the preamplifier to perform current zero control for maintaining an amplitude of the write current at zero, and is capable of changing a time for maintaining the amplitude of the write current at zero according to a pattern of write data.

The patent application was filed on 2022-08-24 (17/821922).

Magnetic disk device and method of ordering commands based on selected scale
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11886753) developed by Abe, Takao, Yokohama Kanagawa, Japan, Nitta, Tatsuo, Tokyo, Japan, and Hara, Takeshi, Kamakura Kanagawa, Japan, for magnetic disk device and method of ordering commands based on selected scale.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A controller provides a plurality of first sections with numerical information on a first scale. The plurality of first sections are obtained by dividing a recording surface of a magnetic disk in units of first memory areas in each of which a first volume of data can be written by an SMR method. The first scale corresponds to a sequence of the first sections. The controller provides a plurality of second sections with numerical information on a second scale. The plurality of second sections are obtained by dividing the recording surface of the magnetic disk in units of second memory areas in each of which the first volume of data can be written by a CMR method. The second scale corresponds to a sequence of the second sections. The controller executes a plurality of commands in order based on a numerical information on the first scale or the second scale.

The patent application was filed on 2022-03-04 (17/687175).

Magnetic disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11887633) developed by Kawabe, Takayuki, Sagamihara Kanagawa, Japan, and Takeo, Akihiko, Tokyo, 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 comprising a magnetic disk, a magnetic head, and a controller that registers an address and a positioning error, determines whether or not a positioning error of a second sector that is two tracks ahead in a radial direction of a first sector to which a data is written is registered, and when the positioning error of the second sector is registered, sets a first threshold that allows a write operation for a positioning error of the first sector based on the positioning error of the second sector, and determines whether or not the positioning error of the first sector exceeds the first threshold, and stops the write operation when the positioning error of the first sector exceeds the first threshold.

The patent application was filed on 2022-09-09 (17/941356).

Magnetic disk device and control method of magnetic disk
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11887634) developed by Watanabe, Toru, Kawasaki Kanagawa, Japan, for magnetic disk device and control method of magnetic disk device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic disk device of an embodiment includes: a head structure including at least one reproducing head and main magnetic pole gap installation portion behind a flying slider and including at least two thermal actuators, and a control unit that can independently control the thermal actuators and that sets spacing of the reproducing head and the main magnetic pole gap installation portion with respect to a recording medium by setting a rotational speed at the time of contact, which rotational speed is a rotational speed of the recording medium, to be lower than a normal rotational speed when the reproducing head and the main magnetic pole gap installation portion are brought into contact with the recording medium.

The patent application was filed on 2022-09-13 (17/931707).

Magnetic disk device and reordering method
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11875829) developed by Hara, Takeyori, Kawasaki Kanagawa, Japan, for magnetic disk device and reordering 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 first head which writes and reads to the first disk, a second head which writes data and reads data to the second disk, a first actuator including the first head, a second actuator including the second head, and a controller which performs a first reordering process for a command scored in a first queue corresponding to the first actuator and performs a second reordering process for a command stored in a second queue corresponding to the second actuator, wherein the controller selects a first command to be executed next by the first actuator based on current and future operating states of the second actuator, and executes the first command.

The patent application was filed on 2021-08-20 (17/408185).

Magnetic disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11875824) developed by Kondo, Yosuke, Fujisawa Kanagawa, Japan, Furuhashi, Kana, Kawasaki Kanagawa, Japan, Takada, Kazuya, Chigasaki Kanagawa, Japan, and Dunn, Eric R., Cupertino, CA, for a magnetic disk device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to an embodiment, each of a plurality of controller chips included in a magnetic disk device includes a buffer control circuit and an arbitration circuit, and controls a corresponding one of a plurality of actuator systems. The first controller chip is connected to a buffer memory via the buffer control circuit included in the first controller chip, and is connected to the second controller chip. The second controller chip is connected to the first controller chip and the third controller chip. The arbitration circuit included in the second controller chip performs arbitration between data transfer between the third controller chip and the first controller chip and data transfer between the first controller chip and an actuator system controlled by the second controller chip among the plurality of actuator systems.

The patent application was filed on 2022-09-06 (17/903785).

Disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11875821) developed by Iwashiro, Masafumi, Kanagawa, Japan, for a disk device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “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.

The patent application was filed on 2022-08-31 (17/900473).

Disk device with heat dissipation layer to suppress excessive heating
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11869543) developed by Tokuda, Kota, Fujisawa Kanagawa, Japan, Yamamoto, Nobuhiro, Okano, Taichi, Yokohama Kanagawa, Japan, Amemiya, Yoshihiro, Chigasaki Kanagawa, Japan, and Yamanaka, Shinra, Yokohama Kanagawa, Japan, for a disk device with heat dissipation layer to suppress excessive heating.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a disk device includes a magnetic disk, a magnetic head, a first FPC, and a second FPC. The first FPC includes first terminals. The magnetic head is mounted on the first FPC and electrically connected to at least one of the first terminals. The second FPC includes a surface, second terminals on the surface, and a first ground plane. The second terminals are individually bonded to the corresponding first terminals with a conductive bonding material. The first ground plane covers at least one of the second terminals in a direction orthogonal to the surface. The second terminals include a first read terminal through which an electric signal representing information read from the magnetic disk by the magnetic head passes. The first ground plane is located apart from at least a part of the first read terminal in a direction along the surface.

The patent application was filed on 2022-09-12 (17/942439).

Magnetic disk device and servo pattern write method
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11869554) developed by Matsunaga, Toshitaka, Yokohama Kanagawa, Japan, for magnetic disk device and servo pattern write method.

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 disk, a head that writes data to the disk and reads data from the disk, and a controller that controls a position of the head so as to write a first spiral servo pattern to the disk, and overwrite a second spiral servo pattern different from the first spiral servo pattern by shifting in a radial direction of the disk from the first spiral servo pattern.

The patent application was filed on 2022-08-15 (17/888224).

Data encryption and decryption in disk device and storage device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11861183) developed by Nomura, Kazumasa, Tokyo, Japan, and Furuhashi, Kana, Kawasaki Kanagawa, Japan, for data encryption and decryption in disk device and storage device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A disk device includes a volatile memory, a nonvolatile memory, and a controller. The controller is configured to receive, from a host, a key setting request that includes a cryptographic key, a key ID thereof, and tag information of the cryptographic key and generate generation information of the cryptographic key. The controller is also configured to store a first entry including the tag information, the cryptographic key, and the generation information associated with each other in the volatile memory, and store a second entry including the key ID and the generation information associated with each other in the nonvolatile memory.

The patent application was filed on 2022-02-24 (17/680137).

Magnetic disk device and parameter setting method of magnetic disk
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11862193) developed by Matsuzawa, Takuji, Kashiwa Chiba, Japan, for magnetic disk device and parameter setting method of 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 an actuator, a controller that controls the actuator, a loop shaping filter connected in parallel with the controller, the loop shaping filter having a parameter for suppressing a rotation asynchronous disturbance affecting the actuator, the parameter of the loop shaping filter being determined using a transfer function from an output of the loop shaping filter to before an input of the rotation asynchronous disturbance, and a notch filter that suppresses mechanical resonance of the actuator.

The patent application was filed on 2022-08-23 (17/893764).

Magnetic disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11862197) 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 which includes two or more independently drivable actuator blocks and performs seek control with a low jerk in which a jerk that is a derivative of acceleration is limited, wherein in a state where a first actuator block is not accessing a data sector of a disk, a second actuator block that is not the first actuator block accesses the data sector of the disk by seek control with a high Jerk.

The patent application was filed on 2022-08-10 (17/885220).

Magnetic disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11862213) developed by Maeto, Nobuhiro, 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 disk that has a track including a first servo sector and a second servo sector that is different from the first servo sector, a head that writes data to the disk and reads data from the disk, and a controller that records first signal strength record data related to a signal strength at which first target servo data that is a target of the first servo sector is read, and standardizes first signal strength data related to a signal strength at which the first target servo data is read when the first target servo data is read.

The patent application was filed on 2022-07-14 (17/865226).

Magnetic disk device and method
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11862204) developed by Furuhashi, Kana, Kawasaki Kanagawa, Japan, for magnetic disk device and method.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic disk device includes a magnetic disk including a track having a plurality of sectors, a motor configured to rotate the magnetic disk, a magnetic head, and a controller. The controller is configured to perform a first read operation of reading target sectors among the sectors of the track, with the magnetic head during a first revolution of the magnetic disk, detect an off-track state of the magnetic head during the first revolution of the magnetic disk, perform a first error correction with respect to data read from the target sectors during the first read operation, and perform a second read operation of selectively reading a part of the target sectors for which the off-track state has been detected or the first error correction is unsuccessful, with the magnetic head during a second revolution of the magnetic disk.

The patent application was filed on 2022-08-26 (17/897062).

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