Patent ID: 11899968
Assignee: TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 4:
5. A method of controlling a magnetic disk apparatus, the method comprising:
receiving a request of read from outside; and,
when data requested to be subjected to the read is first data of an update target stored in a first band among plural bands serving as a storage area, each band being possessed by a magnetic disk and to be subjected to write of data by a Shingled Magnetic Recording method, reading the first data from the first band, storing the first data in the buffer memory, updating the first data in the buffer memory, transmitting the first data in the buffer memory to the outside, and writing the first data in the buffer memory to one of the plural bands, wherein
the magnetic disk apparatus is provided with plural actuator systems, each actuator system being provided with a magnetic head at a distal end; and,
when the data requested to be subjected to the read is the first data and second data of an update target, the second data being stored in a second band different from the first band among the plural bands, the method further comprises
writing the first data in the buffer memory to one band among the plural bands by using a first actuator system that is one actuator system among the plural actuator systems, and, in parallel to the write of the first data using the first actuator system, reading the second data from the second band by using a second actuator system that is different from the first actuator system among the plural actuator systems and storing the second data in the buffer memory, wherein
the buffer memory is provided with a first buffer area and a second buffer area; and
the method further comprises
copying the first data read from the first band to acquire two pieces of the first data, storing third data serving as one of the two pieces of the first data in the first buffer area, storing fourth data serving as another one of the two pieces of the first data in the second buffer area, transmitting the third data in the first buffer area to the outside, and writing the fourth data in the second buffer area to one band among the plural bands.