US 7,321,479 B2
Method for writing spiral reference servo signal in hard disk drive and method for compensating for temperature
Cheol-soon Kim, Anyang-si (Korea, Republic of); Jun-seok Shim, Seongnam-si (Korea, Republic of); and Sung-won Park, Seoul (Korea, Republic of)
Assigned to Samsung Electronics Co., Ltd., Suwon (Korea, Republic of)
Filed on Nov. 18, 2005, as Appl. No. 11/281,369.
Claims priority of application No. 10-2004-0094555 (KR), filed on Nov. 18, 2004.
Prior Publication US 2006/0103967 A1, May 18, 2006
Int. Cl. G11B 21/02 (2006.01)
U.S. Cl. 360—75 9 Claims
OG exemplary drawing
 
1. A method for writing a spiral reference servo signal suitable for a self-servo writing method in a hard disk drive, the method comprising:
writing a first reference pattern in an end direction of a spiral reference servo signal writing concentrically on the disk;
writing a spiral reference servo signal on a current spiral track from a reference writing start position of the current spiral track;
detecting a moving angle of a head to the first reference pattern after the head moved over a predetermined angle, which corresponds to a distance from the reference writing start position to a reference writing end position of the spiral reference servo signal in a case that thermal expansion of the disk does not exist;
compensating for a driving speed of the head with reference to the detected moving angle of the head; and
writing the spiral reference servo signal on a next spiral track at a compensated driving speed of the head.