Patent ID: 11967349
Assignee: KABUSHIKI KAISHA TOSHIBA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 5:
6. A magnetic disk device comprising:
a disk including a first surface and a second surface different from the first surface;
a first head which carries out read and write of data from and to the first surface;
a second head which carries out read and write of data from and to the second surface; and
a controller which adjusts a spiral speed of at least one of the first head and the second head according to a cylinder offset amount corresponding to a positional difference between the first head and the second head, the spiral speed being a speed at which spiral servo patterns are to be written, wherein
the controller calculates the cylinder offset amount as an average value of a plurality of positional differences between the first head and the second head.