wrote:
in fact it has 3 ULTRA3 SCSI 18.2GB disks.

Of course the Machine has slots for 4 such disks. Under the CD drive
there is possibilty for putting extra hard disks but they I believe
cannot be of the same type as those sticking out from front. In the
SCSI cable for extra drives there are only two sockets while power
supply has 3 sockets.