If I understand correctly, the boot drive has to be disk 0. I am not sure how your system is set up, but if the K: drive is not set up to be disk 0, you may need to do that by changing the order in the bios. Not completely sure about this, so maybe kemical will know.
Well, I re-read you post and since you are already booting from K:, I suppose you are ok in that area.