# US 10,504,551 B1 · Magnetic disk device and data processing method of magnetic disk device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,504,551 B1 - Document ID: US10504551B1 - Status: Granted - Kind: B1 - Application number: 16/266,142 - Filed: 2019-02-04 - Granted: 2019-12-10 - Earliest claimed: 2018-09-05 - Assignees: Kabushiki Kaisha Toshiba; Toshiba Electronic Devices & Storage Corporation - Applicants: Kabushiki Kaisha Toshiba; Toshiba Electronic Devices & Storage Corporation - Inventors: Shigeto Kitamura; Kenji Yoshida - Web page: https://patentgrep.com/patent/US10504551B1 ## CPC - G11B 20/10527: {Audio or video recording; Data buffering arrangements (G11B20/12 - G11B20/18 take precedence)} - G11B 20/1217: {on discs} - G11B 5/012: Recording on, or reproducing or erasing from, magnetic disks (G11B17/00, G11B19/00 take precedence) - G11B 5/5578: {Multiple actuators addressing the same disk, e.g. to improve data rate or access rate} - G11B 2020/1062: {Data buffering arrangements, e.g. recording or playback buffers} - G11B 2020/1265: {Control data, system data or management information, i.e. data used to access or process user data} - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract According to one embodiment, a magnetic disk device includes a first controller and a second controller. The first controller includes a first communication circuits and a first buffer and configured to control a first actuator, and the second controller includes a second communication circuit and a second buffer and configured to control a second actuator. The first controller is configured to receive the data from outside by the first buffer and configured to be able to communicate with the second controller through the first and the second communication circuit. ## Claims ### Claim 1 A magnetic disk device comprising: a magnetic disk; a first actuator configured to execute write/read of first data on/from the magnetic disk; a second actuator configured to execute write/read of second data on/from the magnetic disk; a first controller includes a first communication circuit and a first buffer and configured to control the first actuator; and a second controller includes a second communication circuit and a second buffer and configured to control the second actuator, wherein the first controller is configured to receive the data from outside by the first buffer and configured to be able to communicate with the second controller through the first communication circuit and the second communication circuit. ### Claim 2 (depends on 1) The magnetic disk device of claim 1, wherein the data from outside is write data, and the first controller writes first data of the write data on the magnetic disk by means of the first actuator, the first controller transmits second data of the write data other than the first data to the second controller through the first communication circuit and the second communication circuit, and the second controller writes the second data on the magnetic disk by means of the second actuator. ### Claim 3 (depends on 2) The magnetic disk device of claim 2, wherein upon receipt, from a host, of an instruction to read data, the first controller reads first data of read data which is an object to be read from the magnetic disk by means of the first actuator, the second controller reads second data of the read data other than the first data from the magnetic disk device by means of the second actuator, the second controller transmits the second data to the first controller through the second communication circuit and the first communication circuit, and the first controller transmits the first data and the second data to the host. ### Claim 4 (depends on 1) The magnetic disk device of claim 1, wherein the first controller and the second controller respectively include a first setting section configured to set operating in a first operation mode, and a second setting section configured to set operating in a second operation mode, the first operation mode is an operation mode in which control to write the first data of the write data of the first actuator and the second actuator is to be executed, and the second operation mode is an operation mode in which control to write the second data of the write data other than the first data of the first actuator and the second actuator is to be executed. ### Claim 5 (depends on 4) The magnetic disk device of claim 4, wherein when operating in the second operation mode according to the setting of the second setting section, each of the first controller and the second controller disables a function unnecessary for an operation in the second operation mode. ### Claim 6 (depends on 5) The magnetic disk device of claim 5, wherein each of the first controller and the second controller includes a third setting section configured to set operating in a third operation mode in which read/write of data from/on the magnetic disk is executed by means of one actuator. ### Claim 7 (depends on 6) The magnetic disk device of claim 6, wherein the first setting section, the second setting section, and the third setting section are set by an input section provided in each of the first controller and the second controller. ### Claim 8 (depends on 7) The magnetic disk device of claim 7, wherein the input section is an external terminal of each of the first controller and the second controller. ### Claim 9 (depends on 1) The magnetic disk device of claim 1, wherein the first controller and the second controller are the same model number. ### Claim 10 (depends on 1) A data processing method of the magnetic disk device of claim 1, wherein writing first data of write data received from outside on the magnetic disk by means of the first actuator, transmitting second data of the write data other than the first data from the first controller to the second controller, and writing the second data on the magnetic disk by means of the second actuator. ### Claim 11 (depends on 10) The data processing method of the magnetic disk device of claim 10, wherein upon receipt, from a host, of an instruction to read data, reading first data of read data which is an object to be read from the magnetic disk by means of the first actuator, reading second data of the read data other than the first data from the magnetic disk device by means of the second actuator, transmitting the second data from the second controller to the first controller, and transmitting the first data and the second data to the host.