Just a guess but it could be refering to the IDE connector to your HDD. For modern drives this must be an 80 core cable. When IDE first came out it was only necessary to have a 40 core cable as the transfer speed was relatively slow. As the transfer speed increased it was necessary to fit an 80 core cable to combat interference experienced with a 40 core cable. Even though there are still only 40 pins in the drive connector the cable itself has 80 cores. My guess is that you have fitted a 40 core IDE cable An 80 core cable looks the same as a 40 core cable.