cd /dev
mknod -m666 pd_bdm0 c 53 0 
mknod -m666 pd_bdm1 c 53 1 
mknod -m666 pd_bdm2 c 53 2 
mknod -m666 icd_bdm0 c 53 4
mknod -m666 icd_bdm1 c 53 5
mknod -m666 icd_bdm2 c 53 6