how to recover boot-block, if it it corrupted. and what
happens to the os if it gets corruted.

Answer Posted / rahmad

boot cdrom -s
EDITOR=vi
export EDITOR
TERM=vt100
export TERM
mount /dev/rdsk/c0t0d0s0 /a
cd /a
cd /usr/platform/uname-i/lib/fs/ufs
installboot bootblk /dev/rdsk/c0t0d0s0
umount /a
init 6

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