Magnetic disk device and method

A method of controlling a magnetic disk device including a magnetic disk including a plurality of tracks, a first magnetic head, a second magnetic head different from the first magnetic head, a first actuator that moves the first magnetic head, a second actuator that moves the second magnetic head, the second actuator being different from the first actuator, and a buffer memory that receives first data from a host, the method comprising:

• writing, in a first track by using the first actuator, second data having a size corresponding to a first number among the first data, the first track being a track among the plurality of tracks, the first number being a number of writable sectors included in the first track;
• writing, in a second track by using the second actuator, third data having a size corresponding to the second number among the first data, the second track being, among the plurality of tracks, a track different from the first track, the second number being a number of writable sectors included in the second track, the third data being data received subsequent to the second data;
• and
• writing, in a third track by using the first actuator, fourth data having a size corresponding to a third number among the first data, the third track being, among the plurality of tracks, a track different from any of the first track and the second track, the third number being a number of writable sectors included in the third track, the fourth data being data received subsequent to the third data.