DF,
If there isn't a 80 wire cable, then the drive that came with the box was not a speedy one. The newer ones..for sure 100/133 (can't remember if it included the 66's) required the 80 wire cables.
With the 40's, all the wires are signal carriers (potentially). With the 80's, there is a ground wire between each signal wire to prevent bleed over. Bleed over can affect signal integrity, cause errors, and slow down performance.
If there isn't a 80 wire cable, then the drive that came with the box was not a speedy one. The newer ones..for sure 100/133 (can't remember if it included the 66's) required the 80 wire cables.
With the 40's, all the wires are signal carriers (potentially). With the 80's, there is a ground wire between each signal wire to prevent bleed over. Bleed over can affect signal integrity, cause errors, and slow down performance.