Patent ID: 7929232

Claim:
A magnetic disk test method for testing a magnetic disk by scanning a magnetic disk by a composite magnetic head having a write head and a read head which are deviated in position from each other in a track testing direction, writing a test signal in a predetermined track by the write head and reading the test signal by the read head, comprising the steps of: writing the test signal for one track revolution of the predetermined track and further overwriting the test signal, to create an overwritten test signal, after the one track revolution, and setting a test inhibit region having a predetermined width before and after a write end point of the overwritten test signal as a reference and reading the test signal from the predetermined track, wherein the overwriting of the test signal is performed over a connecting region between a write end point and a write start point of the test signal in the predetermined track, where the write end point and the write start point are determined by an amount of a positional deviation between the write head and the read head and a peripheral speed of the magnetic disk such that the predetermined width is narrower than the width of the connecting region.