Method of manufacturing disk device, method of writing servo information to storage disk, and disk device

A method of manufacturing a disk device, comprising:

• moving a head at a predetermined pitch in a radial direction of a storage disk in order to write servo information to each radial direction position in a circumferential direction of the storage disk;
• detecting a positional deviation value of the head while the servo information is being written to the radial direction position and determining whether the positional deviation value exceeds a predetermined value;
• writing a position of defective servo information where the positional deviation value exceeds the predetermined value to a predetermined position in the radial direction of the storage disk when the positional deviation value exceeds the predetermined value;
• controlling the head of the disk device to load the position of the defective servo information written to the predetermined position in the radial direction of the storage disk into a memory after the storage disk is incorporated in the disk device;
• and
• writing the position of the defective servo information to a control information area of the storage disk in order to prohibit using the defective servo information.

A disk device comprising:

• a storage disk configured to store servo information in each radial direction position in a circumferential direction of the storage disk;
• a head configured to read information from and write information to the storage disk;
• an actuator configured to move the head to a predetermined position in a radial direction of the storage disk;
• and
• a controller configured to detect a position of the head based on the servo information read by the head and to control the actuator, wherein
• the controller is configured to move the head at a predetermined pitch in the radial direction of the storage disk in order to read from the storage disk a position of defective servo information where a positional deviation value of the head exceeds a predetermined value when the servo information is written to each radial direction position in the circumferential direction of the storage disk, and to prohibit using a track based on the position of the defective servo information.