The present invention is provided both the S, T reel diameter detectors so as to compute the inertia of both the reels, wherein the acceleration, deceleration torque information spent in the acceleration, deceleration of the T reel is detected from the T reel torque information so as to compute the T reel acceleration, deceleration compensating torque from the acceleration, deceleration torque information, both the reel diameters, the inertia information, and the S reel torque is controlled with the information with the computed results and the back torque information proportional to the S reel diameter being added in it. Thus improving the access property of the tape. IMAGE
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