US 12,243,558 B2
Magnetic disk device and method of managing parity
Takahiro Kawai, Kanagawa (JP); and Tetsuo Kuribayashi, Kanagawa (JP)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP); and Toshiba Electronic Devices & Storage Corporation, Tokyo (JP)
Filed by Kabushiki Kaisha Toshiba, Tokyo (JP); and Toshiba Electronic Devices & Storage Corporation, Tokyo (JP)
Filed on Sep. 8, 2023, as Appl. No. 18/464,110.
Claims priority of application No. 2023-048599 (JP), filed on Mar. 24, 2023.
Prior Publication US 2024/0321314 A1, Sep. 26, 2024
Int. Cl. G11B 20/18 (2006.01); G11B 5/012 (2006.01); G11B 5/09 (2006.01)
CPC G11B 20/1889 (2013.01) [G11B 5/012 (2013.01); G11B 5/09 (2013.01); G11B 20/1833 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A magnetic disk device comprising:
a disk including a first track, the first track including a first data area in which first data is recorded and a first parity area for recording first parity that is used to reconstruct the first data in the first data area;
a storage section which stores information indicating whether the first parity area is a valid parity area in which the first parity is recorded or an invalid parity area in which the first parity is not recorded;
a first determination unit which determines presence or absence of an unexecuted command; and
a first parity management unit which starts to search the storage section for the first parity area after the first determination unit determines that there is no unexecuted command for a specified period of time, generates the first parity based on the first data in the first data area if the first parity area is detected as the invalid parity area, and writes the first parity to the first parity area.