| 摘要 |
An optimum write current, which is supplied to a recording head when the recording head is used for recording information onto a recording medium, is set. An ambient temperature is set. A plurality of write currents are set in the set ambient temperature. A signal is written onto the recording medium with the set plurality of write currents and a demodulation margin is detected for each write current of the plurality of write currents. An optimum write current is determined from the plurality of write currents for the ambient temperature based on the demodulation margins detected for the respective write currents. The above-mentioned operations are performed for each of a plurality of ambient temperatures, and an optimum write current is obtained for each ambient temperature of the plurality of ambient temperatures.
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