Patent ID: 11907113
Assignee: KABUSHIKI KAISHA TOSHIBA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 1:
2. The magnetic disk device of claim 1, wherein
the controller executes, when the number of defects is less than a first threshold, first allocation processing of allocating logical addresses in such a manner that the head sequentially makes access, in the second area, to the sectors of the second area,
when the number of defects is greater than or equal to the first threshold and is less than a second threshold greater than the first threshold, executes second allocation processing of carrying out read/write of data from/to tracks ranging up to a track positioned on this side of the first area and thereafter allocating logical addresses in such a manner that the head is changed to another head and read/write of data is carried out by the new head, and
when the number of defect is greater than or equal to the second threshold, executes third allocation processing of changing a position of the sector from which allocation of logical addresses is to be started in the second area according to a position of the defect to thereby allocate logical addresses.