Patent ID: 7106534
Filing Date: 2006-09-12
Classification: G11B

Abstract:
1. A method for compensating timing to start data writing in a magnetic disk device having one or more magnetic heads, each magnetic head having a write head and a read head with a head gap distance therebetween, the method comprising: writing a predetermined unique pattern generated by a dedicated pattern generating circuit onto an area on a magnetic disk other than a user data area by the one or more magnetic heads, wherein the user data area has a preamble area; measuring the head gap distance in each of the one or more magnetic heads by reading the predetermined unique pattern written onto the area; and compensating the timing to start the data writing onto the user data area by control of a dedicated gap compensating circuit, wherein the dedicated gap compensating circuit changes the timing based on a time gap that corresponds to said measured head gap distance in each of the one or more magnetic heads.