Looking at Gigabyte's site there are four PCB revisions (1.0/1.1/2.0/2.1), do you know which one you have? Are you using the latest BIOS version?
While using AHCI mode (native disabled), install this (reboot if asked) and install this (also reboot if asked). Now try burning again to see if it works.
By the way, the latest driver for your "Gigabyte SATA2 controller" (the GSATA ports) can be found here: ftp://driver.jmicron.com.tw/jmb36x/XP_Vista_Win7/