Patent ID: 11899968
Assignee: KABUSHIKI KAISHA TOSHIBA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 2:
3. A magnetic disk apparatus comprising:
a magnetic disk having plural bands, each band serving as a storage area to which data is written by a Shingled Magnetic Recording (SMR) method;
a buffer memory; and
a control circuit configured to
receive 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 the plural bands, read the first data from the first band, stores the first data in the buffer memory, update the first data in the buffer memory, transmit the first data in the buffer memory to the outside, and write the first data in the buffer memory to one of the plural bands

the buffer memory is provided with a first buffer area and a second buffer area; and
the control circuit is configured to copy the first data read from the first band to acquire two pieces of the first data, store third data serving as one of the two pieces of the first data in the first buffer area, store fourth data serving as another one of the two pieces of the first data in the second buffer area, transmit the third data in the first buffer area to the outside, and write the fourth data in the second buffer area to one band among the plural bands.