I may have that wrong then. On the eMac, I seem to have SYS: on DH1:, and DH0: is a little 60MB partition.
I see. It is that DH0: (i.e. !sys: ) just holds the "kickstart" (the boot.img"). You may go to sys:tools/Mounter and dismount it and don't click on "mount on booting". Then that partition doesn't get mounted during boot up. It is then just invisible as the kickstart ROM is on an C= Amiga. I think it is the standard setting though.