Patent ID: 11862204
Assignee: TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 6:
7. A magnetic disk device comprising:
a magnetic disk including a track having a plurality of sectors;
a motor configured to rotate the magnetic disk;
a magnetic head; and
a controller configured to:
perform a write operation of writing data and a first error correction code into each of first sectors of the track and writing a second error correction code for the data written in the first sectors into a second sector of the track;
perform a first read operation of reading the first and second sectors of the track, with the magnetic head during a first revolution of the magnetic disk;
detect an off-track state of the magnetic head during the first revolution of the magnetic disk;
perform a first error correction with respect to data read from the first sectors using the first error correction codes read therefrom, respectively; and
perform a second read operation of selectively reading a part of the first sectors for which the off-track state has been detected, with the magnetic head during a second revolution of the magnetic disk.