US 12,347,456 B1
Method and magnetic disk apparatus
Yusuke Tomoda, Yokohama 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 Jul. 10, 2024, as Appl. No. 18/768,832.
Claims priority of application No. 2024-046278 (JP), filed on Mar. 22, 2024.
Int. Cl. G11B 27/36 (2006.01); G11B 5/012 (2006.01); G11B 20/00 (2006.01); G11B 20/12 (2006.01); G11B 20/18 (2006.01)
CPC G11B 20/1889 (2013.01) [G11B 5/012 (2013.01); G11B 20/1217 (2013.01); G11B 2020/1232 (2013.01); G11B 2220/2508 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method comprising:
acquiring a result of quality inspection related to recording quality of first multiple sectors included in a first storage area of a magnetic disk provided in a magnetic disk apparatus, the first storage area including first multiple tracks to which data is written by a shingled magnetic recording (SMR) scheme, the first multiple tracks each including different sectors out of the first multiple sectors;
calculating a first number based on a set capacity of the first storage area and a set value of recording density of the first storage area, the first number being a number of sectors corresponding to a capacity obtained by subtracting the set capacity from an actual capacity of the first storage area;
selecting, based on the result of quality inspection, a second number of sectors from among the first multiple sectors, the second number being a number larger than zero and equal to or smaller than the first number; and
assigning addresses to a group of sectors not included in the second number of sectors among the first multiple sectors, the addresses being usable by a host connected to the magnetic disk apparatus, the group of sectors being sectors with a number corresponding to the set capacity.