I have installed Nero 12 and am trying to burn some video files (vobs) using Nero Burning ROM's video option, but it's taking more than 40 minutes. Nero Burning ROM reports that it's burning at 16x (no simulation). My previous experience of Nero (version 9) completed this job in less than half that time burning the same type of files. This is a new system build with a clean install of Windows 8. My burning drive is a tsstcorp cddvdw ts-h653z. I've checked my BIOS settings and this drive has UDMA mode 2 enabled. The drive controller is enabled for RAID so I tried to switch to the two other options given to me in the BIOS settings (SATA and AHCI), but Windows won't even boot selecting these. Checking my Burning ROM logs, I see that Nero sees the burner as non-DMA, even though the BIOS reports it's enabled. I've checked Device Manager and I cannot find an option to enable DMA in Windows. Any help would be much appreciated.