reverts

UDMA 4 Optical drive stuck at UDMA 2 Hello freinds, I have a problem. I bought a Lite-On 20A4P . Manufacturer say it is UDMA 4 but My Win XP shows it UDMA 2. My BIOS shows it UDMA 2 but when i select auto detect, it begins to show UDMA 4, i save and exit and again it reverts back to UDMA 2. I...