I use Intech's ATA Hi-Cap driver on my Sawtooth when using OS X and IIRC the last time I booted into OS 9 I was able to see and use the rest of my 250GB HD that is connected to it's Ultra ATA-66 bus. I can't remember the reason but I think defor mentioned it on #68kMLA once.

idk, I am going to boot into OS 9 after finishing this post to check again. I really don't seem to use OS 9 much anymore so I can't remember.

On a side note, I have been using this since I got my 250GB HD last Jan and have had no data corruption issues.