Magnetic disk apparatus and servo signal recording method

In a magnetic disk apparatus including a magnetic disk for storing information, a head having a writing element for writing information on the magnetic disk and a reading element for reading information from the magnetic disk, and an actuator for moving the head to a desired radial position;

• a servo signal recording method for recording in the magnetic disk a plurality of servo signals to detect a position of the head, comprising:
• a step 1 of recording a clock track by using the writing element of the head;
• a step 2 of measuring the total number of clock bits in one revolution of the clock track by playing back the clock track using the reading element of the head;
• a step 3 of calculating the number of clock bits between servo signals to be recorded by dividing the total number of clock bits measured by the step 2 by the number of servo signals to be recorded;
• and
• a step 4 of recording, by using the writing element of the head, the servo signals at a time interval corresponding to the number of clock bits calculated by the step 3.

In a magnetic disk apparatus including a magnetic disk for storing information, a head having a writing element for writing information on the magnetic disk and a reading element for reading information from the magnetic disk, and an actuator for moving the head to a desired radial position, wherein the magnetic disk has a plurality of servo sectors in which a servo signal is to be recorded and a clock track in which a reference clock is to be recorded, wherein the clock track has a plurality of markers that are arranged at a predetermined interval and whose circumferential positions are identifiable;

• a servo signal recording method for recording in the magnetic disk a plurality of servo signals to detect a position of the head, comprising:
• a step 1 of recording a clock track by using the writing element of the head;
• a step 2 of measuring the total number of clock bits in one revolution of the clock track by playing back the clock track using the reading element of the head;
• a step 3 of calculating the number of clock bits between the servo sectors to be recorded by dividing the total number of clock bits measured by the step 2 by the number of servo sectors to be recorded;
• and
• a step 4 of arranging the servo sectors at a time interval corresponding to the number of clock bits calculated by the step 3 and recording servo signals in the servo sectors by using the writing element of the head;
• wherein, in the step 4, a start position of each servo sector is determined based on detected positions of the markers played back by using the reading element of the head.