A SCSI Format problem

[god23@heaven.org (Bart)]

This is sort of a Mac issue but....:
I have a 40 meg hard drive.  I want to hook it up and reformat it as 2 20 meg 
PRODOS partions to use via appletalk to my //
I have tried this on a IIsi and on an LCII both running system 7.5
I run Disk setup and it fails.  If I 1st partion 1 as a Mac the other as a 
PRODOS it works.  then I can re-partion the 1st as PRODOS too.  

HERE's the prob:

After I reboot it doesn't mount.  I try to mount and it says "Disks larger 
then 4nnn megabytes not allowed on systen 7.x" or something like that..
These are 40 MEG DRIVES!!!
any ideas?

-Bart