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

Claim 2:
3. 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 measures the cylinder offset amount for each of zones formed by dividing the disk in the radial direction and adjusts the spiral speed of at least one of the first head and the second head according to the cylinder offset amount for each zone.