Emax

hello again group- 
in a day or so i hope to convert my baldwin ike to one with an SD card reader as i purchased the pcd-50b and a ton of scsi chips. 

to my question:
i have about 43.5 mb worth of sample banks. i would like to put these on a partition(s) and "lock" them if possible to only be read, not written. kind of like a ROM bank of sounds. but im not sure i can have more than one formatted drive on a removeable media. 

i would also like to have a part of the removeable media which i can store my own samples. 

is there any way to do this? 
if so, what is the best way to do this? 
i understand that the emax might not be able to format/read greater than 20mb at a time. i cant find where i read that though. 

what would you do?