black red yellow, heh, it always makes me smile how the power coloring resembles the german flag
anyhow, yeah it should work, if your drives dont pull a shtload of current it should work just fine...

why would you want a fan to spin counter clockwise?
even if it works, i dont think itll do the leds in the fans any good
and a fan thats mounted to push air running at reverse polarity wont be very good ad pulling air at all...
if you want to pull, you should mount the fan the other way around...