have you already tried AMD’s latest southbridge drivers (XP version 8.9, dated 17-Sep-2008)?
You might also try another IDE cable (80wired, 18" (46cm), flat ribbon).
Yes, and they don’t install ATI IDE driver, but for SB600 you could install manually ATI IDE driver, now Windows reports that driver is improper
Tried 3 different cables, one with 40 wires, new flat with 80 wires, new rounded with 80 wires. No difference.