Clock extraction method for patterned medium, clock extraction circuit for patterned medium and patterned medium

摘要

Aimed at is to match a timing of a clock signal with a magnetic dot of a patterned medium. A magnetic part (16) arraying magnetic dots (15) for recording a magnetic signal at certain intervals and a nonmagnetic part (17) not recording a magnetic signal are featured in the patterned medium. A position of the nonmagnetic part(17) not recording a magnetic signal is detected by a magnetic head and a clock signal is synchronized with a detection signal of the nonmagnetic part.