Magnetic recording apparatus with a magnetic head for writing data to a magnetic disc

Abstract

A magnetic recording apparatus has a magnetic head for writing data to a magnetic disk, a writing circuit for feeding a current to the magnetic head, a controller for controlling the operation of the writing circuit, and a temporary shutoff circuit for shutting off the current temporarily while the operation of the controller is in a transient period. The writing circuit has a first transistor, which is connected to the magnetic head. The temporary shutoff circuit has a second transistor so as to temporarily deactivate and thereafter activate the first transistor when electric power starts being supplied by pulling into the second transistor the transient current resulting from variation in the base voltage of the second transistor as a result of the parasitic capacitor present at the base of the second transistor being charged when electric power starts being supplied.

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