| 摘要 |
The storage device according to the present invention comprises head ICs 1171 and 1172 provided in correspondence to a plurality of magnetic disks 1111 and 111n. When selected, the head IC 1171 outputs a first IC current I1 and the head IC 1172 outputs a second IC current I2. A current/voltage converting circuit 132 converts a synthesized current I0 obtained by synthesizing the first IC current I1 and second IC current I2 to a corresponding IC voltage Vic. A voltage comparing circuit 134 compares a reference voltage Vr to an IC voltage Vic and outputting a result of comparison as a comparison result voltage Vc. A HDC circuit 121C outputs a select command Cs for selecting all IC heads, when a power is turned ON, to the control circuit 125C. The HDC circuit 21C also confirms according to the comparison result voltage Vc whether the number of head ICs is one or two.
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