Do you have a good ohm meter? Use it. Remember that 1/2 or 40 of the wires are connected to ground at one end only. Therefore you probably will get an infinite reading with every other wire if I properly understand how these are made. But the other 40 wires should have nearly identical readings to eachother.
Never seen one like that. All the UDMA 66 cables I've seen have 80 wires and 40 pins. Two wires per pin. Otherwise they wpon't fit the drive connectors.
But . . . my take on your question is simple . . . try and and see. It will just not work if the wire is broken. Then replace it.
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