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Abstract

An off-track characteristics tester for testing an off-track characteristics of an MR head, according to the present invention, comprises spiral scan type read-out unit for reading out a test data recorded on a track of a disk by spirally scanning the track by the MR head while shifting the MR head radially of the disk at such a shifting rate that the MR head traverses a maximum measuring pitch .DELTA.R necessary to obtain data of an off-track profile curve a plurality of times, average value calculation unit responsive to a read-out signal from the read-out unit to calculate an average value TAA of the test data from the read-out unit every revolution of the disk and a memory for storing the average value TAA for each revolution of the disk together with the radial positions of the MR head, wherein the data of the off-track profile curve is obtained from the average value TAA and the data of the radial positions stored in the memory in every revolution.

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First Claim