Patent ID: 7019933

Claim:
A servo information write method, comprising: a first step of positioning an actuator on which a composite head containing a read head and a write head is mounted while said actuator is in contact with a crash stop, and causing the write head to write a servo pattern, a trigger pattern, and a propagation pattern onto a disk-type storage medium, wherein said trigger pattern includes a sync mark; a second step of, when said servo pattern written on said disk-type storage medium by said write head can be detected by said read head, positioning said write head by means of servo control based on detected said servo pattern and causing said write head to further write a servo pattern and a propagation pattern onto the disk-type storage medium; and a third step of determining a write time interval between the instant at which said read head detects said trigger pattern written on said disk-type storage medium and the instant at which said write head writes a next trigger pattern onto the disk-type storage medium, wherein said third step causes said read head to detect a time difference between trigger patterns written onto radially adjacent tracks of said disk-type storage medium.