> this list to handle my SiS 735 chipset. It did seem more stable for a
> while, until I decided to try and enable ultra dma 66 on my primary
> drive. The two partitions that I had mounted got completely corrupted

How did you switch on UDMA66 ?

> hda: Western Digital Caviar WDC AC313000R (it is *not* in the udma
> black list, should it be?)

There is certainly no evidence it should be

> hdb: Western Digital Caviar WDC AC23200L (this one is in the black
> list, but is not being mounted, so it shouldn't matter, right?)

Unknown. But you can test that

> - Was there some change between 2.4.5 and 2.4.17 that could have
>   introduced problems in the IDE layer? I really tried to test 2.4.5

For the SiS possibly. 
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