Were there any drives that used an edge connector or
header to also
supply AC for the motor?
I would hope not. Fortunately every 8" drive I've worekd on has used a
sparate connectore for the motor power, not mounted on any PCB, but I
ahve seen sevearla different types of connector used.
I have worked o na little HP strip printer (I think an HP5055) which
feeds AC to the motor over the same card edges and edge connectors ans
other (isolated-from the mains) signals. but thsese conenctors are hidden
inside the unit, the user is not expected to make connections to them.
-tony