up2board: bios doesn't detect HDD connected to sata


I have taken out HDD from one of my laptops and wanted to boot from it with up2board. I have conncted SATA data (7 pin) cable to both ends (up2 and HDD). HDD itself is powered from external source as I don't have compatibile cable for up2board. Unfortuanetely in BIOS I see only the up2board primary HDD not the externaly conected one? What might be wrong?