| 摘要 |
A shift code that consists of N-symbol code words is provided as an L-symbol “master sequence” in which no sub-sequence of N symbols repeats, where L≦̸SN and S is the number of code symbols. A decoder determines a location in the code from N decoded symbols. The code locations may, for example, correspond to radial positions, or other position, times, and so forth. In one embodiment, the master sequence is continuously written to a data storage disk during a spiral write operation and a reader on a given circular track reads at least N symbols from the portion of the spiral that crosses the track and determines a code word. The radial position of the reader is then determined based on the location of the code word in the code.
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