| 摘要 |
A sector address recognition part recognizes a sector address in a magnetic disk where ID areas for storing sector address information and head address information are omitted. This is accomplished by generating a sector pulse when a predetermined count is reached after a detection of a servo mark and when an interval between adjacent servo marks included in servo information that also includes cylinder address information is a preset interval. A head identifier recognition part recognizes a head identifier on the basis of, for example, positions at which the servo information is recorded.
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