Patent ID: 7898755
Filing Date: 2011-03-01
Classification: G11B

Abstract:
1. A measuring method for measuring a write sensitive width and/or a read sensitive width of a composite magnetic head having a write head and a read head, comprising the steps of: reading a servo information from a designated track of a rotating magnetic recording medium having a recording layer of discrete track type, a bit pattern type or other type having uneven pattern, crossing the designated track obliquely by the composite magnetic head at a designated speed K in a radial direction of the magnetic recording medium and reading a test data in the designated tack by said write head and writing a test data in the designated track by the write head under an ON track servo control for ON-tracking by reading a servo information from the designated track of the rotating magnetic recording medium, reading the test data from the designated track by the read head by positioning the composite magnetic head under the ON track servo control, obtaining a read characteristics profile for a read voltage corresponding to a track scanning time of the read head on the basis of the read signal of the read head, and calculating the write sensitive width by multiplying the test data scanning time of the read head with the designated moving speed K.