Information storage device having transducers operating in a pulse mode in synchronism with a timing clock

An information storage device comprising:

• information recording media on which signals modulated by a specified rule are recorded;
• a magneto-resistive head which detects said modulated signals from said information recording media;
• a converter which converts output signals from said magneto-resistive head to digital values;
• a demodulator which employs a partial-response system for retrieving data from said digital values;
• an amplifier supplying a sense current, based on a pulse train to said magneto-resistive head or a dummy resister whose resistance is almost the same as that of said magneto-resistive head, and
• a clock generator that generates said pulse train in synchronism with a clock used for said partial-response system, supplies said pulse train to said amplifier, and drives said amplifier to generate a pulsed sense current for said magneto-resistive head, and
• wherein said magneto-resistive head detects signals using said pulsed sense current in synchronism with said partial-response system.