Q: What are "mode settings"? What are these settings for?
A: These settings are for drive/device transfer rates
UDMA5 - ATA-100 drives (UDMA100 hard drives)
UDMA3/UDMA4 - ATA-66 drives (UDMA66 hard drives)
UDMA1/UDMA2 - ATA-33 devices (standard UDMA33 hard drives and most other modern IDE devices)
PIO - Non-DMA or Pre-DMA devices (older hard drives under 1GB, older CD-ROM devices)
MW-DMA - DMA mode usually associated with CD-ROM devices.
http://www.highpoint-tech.com/370faq.htm
letzer Satz, ob man das 1zu1 für deinen Controllerchip übernehmen kann, weiß ich nicht, allerdings wäre es einen Versuch wert