Can someone with a two-drive MkII tell me what device their /drive1 is mounted from?

Mine is mounted from /dev/hdb4, and it seems to be causing all kinds of problems. I thought I had read somewhere that MkII's would use only a single IDE controller, but unless I'm the only two-drive MkII out there, I would think the amount of bugs I'm noticing would have been corrected long ago...

D