boot0 installation not permitted in single slice config

[Saifi Khan]

Hi all:

Trying to install the 'boot0' boot manager on the MBR, from the
Fixit# command prompt as

Fixit# boot0cfg -v -B -o noupdate /dev/ad4

the response is:
boot0cfg: write_mbr: /dev/ad4: Operation not permitted.

i've configured a single slice for the entire disk as
Fixit# fdisk -B -I /dev/ad4

Is it that by default the sector 0 is taken as the start point
if the entire disk is configured with a single slice ?


thanks
Saifi.