Magnetic disk device and signal synchronization method

A signal synchronization method implemented by a magnetic disk device, the magnetic disk device including:

• one or more magnetic disks on each of which tracks are provided, each of the tracks including data sectors;
• one or more first magnetic heads and one or more second magnetic heads, each configured to write data and read data to and from data sectors of the one or more magnetic disks;
• a first actuator system configured to move the one or more first magnetic heads;
• a second actuator system configured to move the one or more second magnetic heads;
• a first controller chip configured to control the one or more first magnetic heads and the first actuator system;
• and a second controller chip configured to control the one or more second magnetic heads and the second actuator system, the signal synchronization method comprising:
• generating, by the first controller chip, a reference signal of operation, the reference signal being detected and counted by the first controller chip and the second controller chip;
• transmitting, by the first controller chip, the reference signal to the second controller chip;
• receiving, by the second controller chip, the reference signal;
• regenerating, by the second controller chip, the reference signal;
• and
• performing, by the second controller chip, synchronization with the first controller chip based on the reference signal regenerated.