I dont know, some WD drives can be very picky, or at least with me anyway. whenever I put a WD HD into my comp, I need to set the jumper to cable select, or it messes up my machine. (thats y i dont use WD anyway, I like seagate. WD raptors are my only exception now) but now most mobo jumpers are used to control front panel ports (1394EEE,USB, and audio) depending on what you have it jumped to will tell the board what signal to give out.