I am having problems getting my new 3500 to burn at speeds above ~8x. My second IDE channel refuses to run at anything above Multiword mode 2. I tried messing with my VIA bus master ide controller driver and ended up having to reinstall windows after the updated drivers refused to let me use the drive at all. Also, I tried using VIA's IDEtool to change to UDMA33, but after restart, I was right back to Multiword mode 2. I have been able to find other instances of people with this problem, but nobody seems to have a good answer about how to fix it.
Athlon Thunderbird 1.33 Socket A
Gigabyte GA-7DX with AMD 760 Northbridge and VIA 686B Southbridge
512 MB PC2100
Windows XP Pro with every update except SP2
Primary IDE Channel: Master:Maxtor 160GB at UDMA mode 5
Slave: WD 200GB at UDMA mode 5
Secondary IDE: Master: NEC 3500 running at Multiword mode 2
Slave: Pioneer 106 running at Multiword mode 2
Does anyone have any ideas?