I got my new HD cable this morning, I also thought it was this @|#{@@ cable, but no.
I tried ALL the combinations with jumpers & HD position (it seams HDs don't react the same when they are on the 1st or 2nd cable slot):
HD1master-1st on the cable/HD2slave
HD1master-2st on the cable/HD2slave
HD1slave-1st on the cable/HD2master
HD1slave-2nd on the cable/HD2master
(I only had 1 jumper so I didn't check the dual cable select case).

But nothing was working... except this funny trick.

NB: both drives are bootable (2b11)