Patent ID: 7242551

Claim:
A method for inspecting a track pitch of a magnetic disk in a magnetic disk drive having both a read head and the magnetic disk which includes a data region and on which a first burst pattern and a second burst pattern are recorded, said method comprising: setting reference PES gain PG 0 with respect to the read head; moving the read head to a position K present between a center of the first burst pattern and a center of the second burst pattern; generating, at the position K, by use of the PG 0 , a first position detection signal from a first burst signal obtained by reproducing the first burst pattern, and a second position detection signal from a second burst signal obtained by reproducing the second burst pattern; calculating PESΔ that is a difference between the first position detection signal and the second position detection signal; evaluating the PESΔ; and identifying, in response to the evaluation of the PESΔ, a data region related to the first burst pattern or to the second burst pattern.