Enabling the UDMA feature on VIA based board
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To enable the UDMA feature on VIA-based board, download and install the bus master driver. After installing it, run the Bus master driver AGAIN and choose ENABLE/DISABLE (ULTRA) DMA on the option: 
* INSTALL
* UNINSTALL
* ENABLE/DISABLE (ULTRA) DMA

After selecting that option, you will see below menu on the next page;

* SETUP HARD DRIVE DMA MODE 
* (HDD Model) (DMA Mode)
* (CD_ROM Model if any) (DMA MODE)

Make sure that there is a check mark on the box to enable that feature then click NEXT. After that, the system will restart.