In a PC, a 34-wire ribbon connects the floppy drive (if present) to the motherboard. A 40-wire cable connects the IDE (ATA) CD drive, and an 80-wire cable is used for the IDE (ATA) hard disks.
The ribbon cable coming from the hard drive head will have two wires that have a resistance anywhere from 4 to 40 ohms — this is actually the coil that controls the head, hence the resistance.
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