there are also potential compatability issues between sata150 controllers and sata300 drives (which most new ones are).
how old is your mobo?
like the posters above suggested, first try to open disk manager, see if you see it, if its there it should prompt you to write s signature (I dont 'upgrade' the disks, btw, ymmv)
if its not in disk manager, go into bios and set that sata controller to 'legacy' or 'ide'