Magnetic disk device having two regions of different thicknesses

A magnetic disk device comprising:

• a disk including a first region and a second region different from the first region;
• a head that writes data on the disk and reads data from the disk;
• an actuator that positions the head on the disk;
• and
• a controller which positions the head by driving the actuator and writes data in the first region and the second region with the head, wherein
• a skew angle of the head with respect to a circumferential direction of the disk varies within a first angle in the first region, and varies, in the second region, from a second angle larger than the first angle to a third angle larger than the first angle and the second angle,
• a thickness of the second region is greater than that of the first region, and
• the controller writes first data to be accessed at a first number of times in a first period in the first region, and writes second data to be accessed at a second number of times smaller than the first number of times in the first period in the second region.