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3. UDMA mode limitation
In the older Award BIOSes was the HDD set to highest supported mode, it was not problem when only UDMA33 HDDs were produced, but later problem arised: HDD was programmed to e.g. 66 MHz and chipset maximum was 33 MHz, the result was unreliable operation. There are some solutions, switch off UDMA in BIOS setup at all, or use special program supplied by HDD manufacturer and switch off ATA/66 support. Better way is to implement this directly into the BIOS code. FYI:
UDMA mode 2 = ATA/33
UDMA mode 4 = ATA/66
UDMA mode 5 = ATA/100
UDMA mode 6 = ATA/133
Indeed UDMA will not work with that IDE chip because it was never designed for that. The 430TX chipset DOES indeed support UDMA but the Prime 3C IDE does not.