Data recording method in which pilot signal period coincides with cumulative bit disparities of insert data

DETAILED DESCRIPTION It is hence a primary object of the present invention to present a method for superposing a pilot signal for tracking at the time of production so as not to disturb the judgement of whether a bit is 1 or 0 during reproduction, in a high density magnetic recording apparatus.
To achieve the object, the present invention presents a data recording method for tracking by recording a pilot signal on a track of a recording medium, and reproducing the pilot signal from the recording medium, wherein each codeword has an n-bit (n being 1 or a larger integer), each bit consisting of 1 and 0, and using a codewords of which disparity defined by a difference in a number of 1's and 0's is +k (k being 1 or larger integer) in every n bits, a codeword whose disparity is -k, and a codeword whose disparity is 0, data are recorded so that a period of cumulative value of disparities in every n bits of the codewords is equal to a period of the pilot signal.
A data row recorded in such a data recording method is recorded so that the cumulative value of disparities of every n bits may vary in the period of the pilot signal.
An increase or decrease of the cumulative value of disparities is the pilot signal.
In the present invention, since the data row to be recorded itself generates the pilot signal, an error rate is not increased if recorded by enlarging an increase or decrease of disparities so that the amplitude of the pilot signal may be larger.
In the data recording method of the present invention, it is possible to effect recording by increasing amplitude of the pilot signal for tracking at a time of reproduction without increasing the error rate during reproduction, so that a system having a narrow track width can be realized .