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Step 2: Cutting

Picture of Cutting
Get your IDE or floppy cable and cut right in between where the wires are held together. Do it every 2-3 wires. Then pull them apart to the head of the cable.
 
Actually you need to maintain pairing, if it is 80conductor cable, high speed. One is data and each second is grounding, so if you want cable speed, you need to slice cable by dividing by 2. And always is option to yust round it up :)