DEC Rainbow

I just grabbed a Rainbow out of the garbage with the garbage truck literally meters away from getting it. After major industrial cleanup (removing the half gallon of house paint from it and the cigarette goo), Its up and running mostly. It came with the MS-Dos 2.05 OS, some manuals, and thats it. I know diddly squat about this beast (other than the legend of it possessing two CPU's) and CP/M. So this is a very basic question. When I get to the menu at boot up it recognizes a: and b: (though a: is a bit wonky). It will also respond to W which tells me that there are two cp/m partitions: e: and f: however, when I try to go to them I get a "message 23 - Non-System Diskette". I seem to be missing the manual with numbered error messages. I'm assuming that this means that there is a hard drive problem. However, it is recognizing the partitions so something is being read. I also don't have the CP/M diskette, only the DOS. This DOS doesn't have FDISK so I can't look at the partitions via an OS I know well (though I could do it through debug but I'm being lazy here), and when I bit the bullet and tried to format the hard drive it keeps telling me to stick in the diskette to format. Any help would be appreciated otherwise I'll do a low level format on the segate drive and pray to the appropriate dieties. Colan