| 摘要 |
A magnetic recording medium and a data reproducing apparatus are provided in which, with the use of a required number of bits, the address information may be reliably reproduced even during the track-traversing seek operation without increasing redundancy to the track specifying address information. On a magnetic disk, there are recorded track addresses in which, with the bits magnetized in the running direction of the magnetic head being 1 and with the bit magnetized in the opposite direction being 0, the direction of magnetization represents a Grey code, and data "1" in the air gap of the track address. A servo detection circuit has a viterbi decoder for viterbi decoding the reproduced signals of the track addresses and the playback signal for the air gap for reproducing the track addresses. This assures reliable decoding of the track addresses without increasing redundancy to the number of bits of the amount of information as the track addresses while the properties of the Grey code are maintained.
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