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

Magnetic disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11842047) developed by Koyama, Kenji, Yokhama 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 power supply, a magnetic disk, a magnetic head, a communication unit that is communicable with a host computer and transmits a signal to the host computer at a first interval, a power supply monitor, a volatile memory that stores data related to read/write processing on the magnetic disk by the magnetic head, a non-volatile memory, and a controller that controls the communication unit to start processing of backing up the data stored in the volatile memory to the non-volatile memory and transmit the signal at a second interval longer than the first interval if power supplied from the power supply is detected to be disconnected based on monitoring of the power supply monitor.”

The patent application was filed on 2022-03-10 (17/691783).

Disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11823717) developed by Tokuda, Kota, Fujisawa Kanagawa, Japan, Amemiya, Yoshihiro, Chigasaki Kanagawa, Japan, Yamanaka, Shinra, Yamamoto, Nobuhiro, and Okano, Taichi, Yokohama Kanagawa, Japan, for a “disk device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A disk device according to one embodiment includes a magnetic disk, a magnetic head, and a flexible printed circuit board. The flexible printed circuit board is electrically connected to the magnetic head. The flexible printed circuit board includes a first layer, a second layer having conductive property, and a third layer having insulation property. The first layer includes a first surface having insulation property. The second layer overlays the first surface, and includes a first conductor and a second conductor spaced from the first conductor. The third layer covers at least a part of the first surface and at least a part of the second layer. The flexible printed circuit board is provided with a first hole that is located between the first conductor and the second conductor with spacing from the second layer and penetrates the third layer.”

The patent application was filed on 2022-03-08 (17/689873).

Magnetic disk device stored trace data of RW processing
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11817133) developed by Aida, Kimiyasu, Kawasaki Kanagawa, Japan, and Takada, Kazuya, Chigasaki Kanagawa, Japan, for a “magnetic disk device stored trace data of the read/write processing.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk device incudes a first magnetic disk, a first actuator that reads/writes data from/to the first magnetic disk, a first controller that controls the first actuator, a second magnetic disk, a second actuator that reads/writes data from/to the second magnetic disk, a second controller that controls the second actuator, wherein the first controller executes read/write processing, and the second controller stores trace data of the read/write processing when the first controller executes the read/write processing.”

The patent application was filed on 2022-03-01 (17/652984).

Disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11817136) developed by Hara, Takeyori, 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, 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.”

The patent application was filed on 2022-08-22 (17/892917).

Magnetic disk device and dol setting method
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11817123) developed by Maeto, Nobuhiro, Yokohama Kanagawa, Japan, for “magnetic disk device and dol setting method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk device including a disk, a head which writes data to the disk and reads data from the disk, and a controller which sets a first DOL for a first sector group and a second DOL for a second sector group to different values, the first sector group including one or more first sectors and a first parity sector, the first sectors which allow an error correction process to be performed for each track based on the first parity sector, and are continuously arranged in a circumferential direction of the disk from the first parity sector, the second sector group including one or more second sectors which allow no error correction process to be performed for each track, and are continuously arranged in the circumferential direction.”

The patent application was filed on 2022-08-15 (17/888255).

Magnetic disk device and filter coefficient setting method of magnetic disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11804244) developed by Matsuzawa, Takuji, Kashiwa Chiba, Japan, for “magnetic disk device and filter coefficient setting 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 includes a controlled object, a controller which controls a motion of the controlled object, and loop shaping filters each connected in parallel to the controller. During a determination of coefficients of the loop shaping filters using a transfer function from outputs of the loop shaping filters to before an input of a disturbance affecting the controlled object, the first set of coefficients of each the loop shaping filter is determined by reflecting a frequency response of the other loop shaping filters, and the determined first sets of coefficients of the loop shaping filters are set to the loop shaping filters, respectively.”

The patent application was filed on 2021-08-06 (17/395828).

Magnetic disk device and method for switching bias voltage and drive voltage of microactuator
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11783855) developed by Hara, Takeyori, Kawasaki Kanagawa, Japan, for “magnetic disk device and method for switching bias voltage and drive voltage of microactuator.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “According to one embodiment, a magnetic disk device including a disk, a head that writes data to the disk and reads data from the disk, an actuator that is rotationally driven and controls movement of the head mounted above the disk, a microactuator that is mounted on the actuator and finely swings the head in a radial direction of the disk by a piezoelectric element that extends and contracts when a drive voltage based on a bias voltage is applied to the piezoelectric element, and a controller that switches the bias voltage according to an operation state during an access process.”

The patent application was filed on 2022-01-25 (17/583897).

Magnetic disk device and method for measuring counter electromotive voltage of spindle motor
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11776573) developed by Chen, Yu, Sagamihara Kanagawa, Japan, Ozeki, Kenichiro, and Miyamoto, Koichiro, Yokohama Kanagawa, Japan, for “magnetic disk device and method for measuring counter electromotive voltage of spindle motor.“

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 magnetic disk, a spindle motor that rotates the magnetic disk, a motor driver, and a controller. The motor driver supplies a motor current to the spindle motor and measures a counter electromotive voltage of the spindle motor every time the spindle motor makes one rotation. After the rotation of the magnetic disk starts, the controller adjusts a motor position where the counter electromotive voltage is measured to a set first position.”

The patent application was filed on 2021-03-10 (17/197158).

Reducing non-coherent repeatable runout in 2D magnetic recording disk drives
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices & Storage Corporation, Tokyo, Japan, has been assigned a patent (11776570) developed by Szita, Gabor, Mountain View, CA, for “reducing non-coherent repeatable runout in two-dimensional magnetic recording disk drives.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A method for positioning a magnetic head having first and second read sensors and one write head includes: while the magnetic head is at a first position relative to a disk medium, reading first magnetic servo information written on a first surface of the disk medium, with the first read sensor, and reading second magnetic servo information written on the first surface of the disk medium with the second read sensor, determining a position error of the magnetic head based on the first and second magnetic servo information, and repositioning the magnetic head to a second position relative to the disk medium to compensate for the determined position error of the magnetic head.”

The patent application was filed on 2022-02-18 (17/676010).