Toshiba Electronic Devices and Storage Assigned Twelve Patents

Magnetic disk device and refresh processing
Kabushiki Kaisa Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,490,223) developed by Isokawa, Hiroshi, Yokohama Kanagawa, Japan, for “magnetic disk device and refresh processing 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 disk, a head that writes data to the disk and reads data from the disk, and a controller. The controller is configured to read first data written on the disk, measure a first read error rate of the first data, determine a difference in the first read error rate from a previously determined read error rate of the first data, determine a current read error rate for second data written on the disk based on the difference in the first read error rate from the previously determined read error rate, and determine whether a refresh process is performed on the second data based on the current error rate.”

The patent application was filed on August 17, 2018 (16/104,831).

Disk device
Kabushiki Kaisa Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,490,217) developed by Akatsuka, Naoto, 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, a disk device includes a first actuator assembly and a second actuator assembly which are respectively supported by a first bearing unit and a second bearing unit to be rotatable about a support shaft. The first bearing unit includes a first sleeve and a ball bearing. The second bearing unit includes a second sleeve and a ball bearing. The first sleeve includes a first end surface opposed to the second sleeve and an annular first step projecting from the first end surface, and the second sleeve includes a second end surface opposed to the first step with a gap and an annular second step projecting from the second end surface. The second step is opposed to the first step and the first end surface with a gap.”

The patent application was filed on August 17, 2018 (15/998,870).

Magnetic disk device and method for correcting positon of head
Kabushiki Kaisa Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,475,478) developed by Tagami, Naoki, Yokohama Kanagawa, Japan, for “magnetic disk device and method for correcting positon of head.“

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 including a track including a plurality of servo sectors, a head including a write head which writes data to the disk and a plurality of read heads which read the data from the disk, and a controller configured to simultaneously acquire a plurality of pieces of correction data for repeatable runout of the disk by the read heads, acquire a first correction data and a second correction data based on the correction data, write the first correction data and the second correction data to the disk, and correct a position of the head based on the first correction data and the second correction data.”

The patent application was filed on August 6, 2018 (16/055,851).

Disk apparatus and dual actuator assembly having wiring board with bent connection portion
Kabushiki Kaisa Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,475,475) developed by Hasegawa, Hisashi, Yokohama Kanagawa, Japan, for “disk apparatus and dual actuator assembly having a wiring board with a bent connection portion.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A disk apparatus includes recording disks and a first and a second actuator assembly that rotate about a support shaft and that each include: an actuator block, a wiring board having connection terminals and installed on an installation surface of the actuator block, and head assemblies each attached to the actuator block via an arm and each including a head and an interconnection member. The wiring board of each of the first and the second actuator assembly has a connection portion connected to one of the connection terminals and located adjacently to a boundary between the first and the second actuator assembly, and the connection portion of the first or the second actuator assembly is bent with respect to the installation surface.”

The patent application was filed on August 31, 2018 (16/119,247).

Defect registration
Kabushiki Kaisa Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,460,761) developed by Kashiwagi, Kazuto, Yokohama Kanagawa, Japan, for a “defect registration method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”According to one embodiment, a defect registration method includes measuring, performing first extracting, and registering. The measuring is measuring, on a unit-area basis, performance of a storage area of a magnetic disk including a plurality of unit areas. The storage area includes a redundant area of a set capacity. The first extracting includes second extracting one or more unit areas in order of increasing the performance. The registering is registering the extracted unit areas of the set capacity as defect locations.”

The patent application was filed on August 29, 2018 (16/116,237).

Magnetic disk device and actuator control
Kabushiki Kaisa Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,453,486) developed by Sudo, Daisuke, Yokohama Kanagawa, Japan, for “magnetic disk device and actuator 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 disk, a first head, a second head, an actuator configured to position the first head and the second head over the disk, and a controller configured to control the actuator based on a first value having a first waveform suppressing a disturbance component, wherein the controller is configured to invert, in the first waveform, a polarity of a third waveform succeeding a first timing with respect to a polarity of a second waveform preceding the first timing in a case where the first head is changed to the second head at the first timing.”

The patent application was filed on August 13, 2018 (16/101,662).

Disk apparatus with filter unit having detachable frame
Kabushiki Kaisa Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,446,177) developed by Suzuki, Hirofumi, Kawasaki Kanagawa, Japan, and Kato, Yasuhiko, Setagaya Tokyo, Japan, for a “disk apparatus with filter unit having detachable frame.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A disk apparatus includes a casing, a rotatable disk recording medium that is disposed within the casing, a head configured to process information with respect to the recording medium, an actuator assembly that is disposed within the casing and that movably supports the head, and a filter unit that is disposed within the casing. The filter unit includes a base section fixed to an inner surface of the casing, a holding frame coupled to the base, and a collection filter detachably held in place by the holding frame.”

The patent application was filed on August 31, 2018 (16/119,559).

Disk device, controller circuit, and control
Kabushiki Kaisa Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,438,615) developed by Maruyama, Syosuke, Tokyo, Japan, and Furuhashi, Kana, Kanagawa, Japan, for “disk device, controller circuit, and control method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A disk device includes a recording medium on which data is recorded, a decoding circuit configured to decode data read from the recording medium, and a control circuit. The control circuit is configured to cause first data associated with a target sector referenced in a read request to be read from a target track of the recording medium, second data associated with a non-target sector that is not referenced in the read request to be read from the recording medium after the first data is read from the recording medium, and decoding of the first data to be completed by the decoding circuit after the second data is read from the recording medium.”

The patent application was filed on March 14, 2019 (16/353,676).

Magnetic head control capable of avoidance media bumps during seeking process
Kabushiki Kaisa Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,431,247) developed by Kuribayashi, Tetsuo, Yokohama Kanagawa, Japan, Kanno, Hironori, and Tashiro, Masami, Komae Tokyo, Japan, for a “magnetic head control capable of avoidance media bumps during seeking process.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”According to one embodiment, a magnetic disk drive selects in command evaluation in reordering processing, a command accessible in a shortest time. The device determines whether media bumps which influence a dynamic flying height, (DFH) control exist in a seek section between completion of a previous command and start of a selected command or not, calculates a latency necessary for avoidance of the media bumps if it is determined by the determination that the media bumps which influence the DFH control exist, and selects the command accessible in the shortest time including the time obtained by summing the latency calculated by the calculation as the command to be next processed.”

The patent application was filed on March 13, 2018 (15/919,783).

Disk device with sealing substrate that covers through hole of housing
Kabushiki Kaisa Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,418,070) developed by Okamoto, Makoto, Kodaira Tokyo, Japan, for a “disk device with sealing substrate that covers through hole of housing.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A disk device includes a housing that includes a base with a through hole formed therein and a cover fixed to the base, wherein the housing contains a low density gas, a plurality of heads and a wiring member disposed within the housing that includes conductors that are electrically connected to the heads, a sealing substrate that is fixed to the base and covers the through hole, a control circuit board that is disposed outside the housing and adjacent to a back surface of the base, a first two-piece connector that is disposed within the housing and connects the sealing substrate and the wiring member, and a second two-piece connector that connects the sealing substrate and the control circuit board. The second two-piece connector includes a first connector mounted on the sealing substrate and a second connector that is mounted on the control circuit board.”

The patent application was filed on February 9, 2018 (15/893,421).

Magnetic disk device and method of controlling
Kabushiki Kaisa Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,403,323) developed by Kojima, Shuichi, Ota Tokyo, Japan, for “magnetic disk device and method of controlling the same.“

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, a head, and a controller configured to control the head based on a plurality of upper parameter groups each corresponding to a plurality of upper areas among a plurality of parameter groups each corresponding to a plurality of recording areas into which the disk is divided in a radial direction, the upper areas each corresponding to the recording areas, and a plurality of lower parameter groups each corresponding to a plurality of lower areas into which the upper areas are each divided in the radial direction, the lower parameter groups being different from the upper parameter groups among the parameter groups.”

The patent application was filed on September 10, 2018 (16/126,362).

Magnetic disk device which controls recording operation and non-recording operation
Kabushiki Kaisa Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,403,308) developed by Koizumi, Gaku, Kanagawa, Japan, Takeo, Akihiko, Tokyo, Japan, Narita, Naoyuki, Ohtake, Masaya, Tomoda, Yusuke, and Maeda, Tomoyuki, Kanagawa, Japan, for “magnetic disk device which controls a recording operation and a non-recording operation of a recording head and a recording head control method of the 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 conforming to perpendicular magnetic recording includes a magnetic disk, a recording head, and a controller. The head includes a main magnetic pole, a return magnetic pole, a recording coil, and a conductive member in which end surfaces are connected to opposed surfaces of a write gap which is opposed to a distal portion of the main magnetic pole and a distal portion of the return magnetic pole, and a resistance value varies. The controller applies a current to the recording coil to excite the magnetic flux in the recording operation, and applies a current at a constant voltage to the magnetic circuit via the comductive member.”

The patent application was filed on February 14, 2018 (15/896,281).