| 摘要 |
Embodiments of the invention reduce the information (storage) overhead for determining the rotational position of a magnetic disk medium, as well as reducing the rotational position detection time. In one embodiment, a sector servo magnetic disk medium is configured such that: each track is divided into blocks each including a series of sectors; each block stores a positional information bit string as rotational position information; the positional information bit string is made up of a position code and an identification code, the position code including a block number, the identification code being used to identify the start or the end of the position code; and each bit of the positional information bit string is stored in a different sector of the block. When each block is made up of 12 sectors, for instance, if the block number is denoted as b<SUB>0</SUB>b<SUB>1</SUB>b<SUB>2</SUB>b<SUB>3</SUB>b<SUB>4</SUB>b<SUB>5</SUB>, the positional information bit string may be expressed as 00001b<SUB>0</SUB>b<SUB>1</SUB>b<SUB>2</SUB>1b<SUB>3</SUB>b<SUB>4</SUB>b<SUB>5</SUB>, where the first 5 bits "00001" constitute an identification code.
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