Comment 158 for bug 346691

Probably the bug is still there as long as there are no ata-piix related changes in the changelog. Other than that it appears data corruption bugs and system stability aren't very high priority with the Ubuntu devs :S
Even with my controller in AHCI mode, I've experienced several different types of crashes & hangs with the AMD64 kernel (no data corruption anymore though!). I'll be trying out Karmic soon on my hardware, I guess we should hope Karmic won't be such a catastrophe as Jaunty.