| 摘要 |
A disk drive of a perpendicular magnetic recording type uses a double-layered disk. The disk has a plurality of tracks for storing data and a non-recording region (GB area) between tracks. Not a DC magnetized pattern but an AC magnetized pattern or a random magnetized pattern is recorded in the GB area. With this structure, it is possible to prevent an influence of magnetic disturbance due to a DC magnetic field on the surface of the disk.
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