| 摘要 |
<p>A recording head (30), which moves relative to a magnetic disk (103) on the surface of the magnetic disk and produces magnetization according to information to be recorded on the surface thereof, includes a coil (312) that is supplied with a recording current, modulated in accordance with a run-length limited code, to generate a magnetic field according to the recording current. In the run-length limited code, a run-length that represents a sequence of "0" in binary numbers presenting the information to be recorded is limited to a predetermined upper limit or lower. The recording head further includes a magnetic core (312) extending through the coil (312). A main pole (312a) at one end of the magnetic core (312) faces the surface of the magnetic disk (103). The magnetic core (312) guides the magnetic field generated by the coil (312) to apply the magnetic field from the main pole (312a) to the magnetic disk (103), thus producing magnetization. The length of the main pole (312a) in the direction orthogonal to the magnetization corresponds to the upper limit.</p> |
