Yes, I removed the 5V connector - no desire to fry anything! Using my straight through cable I could calibrate, but the motor wouldn't run. Swapped it for one with a twist and away it went. I didn't investigate much further simply as I didn't have time. It's feasible it's a duff cable but I've been using it happily with other thingsBarryB wrote: I use a straight cable with my Amstrad FD-1 3" drive and have no issues with the motor not spinning? Have you disconnected the 5v connector from the 34pin / 26pin board inside the 3" drive?