So, the drive works in Windows, but you cannot see it in the BIOS, correct? Unless you are trying to boot from the drive, it shouldn't be a problem. However, you can go to Gigabyte's support site and download the latest drivers/firmware for your laptop. If that doesn't work, you can also download the latest BIOS update as well from the same location.
I try to download it from here:http://gigabyte.com/support-downloads/download-center.aspx
but when I choose Notebook in Category, I haven't option for my laptop series (W566) in My Series drop down list.