Thanks for a quick response from Brian Hostetter <brianh_at_netins.net>
He suggested to use scu to check and reassing bad blocks:
scu -f /dev/rrz0c
scu> verify media lba ##### (Block number) if bad
scu> reassign lba #####
scu> exit
Gerfried Kumbartzki
Received on Mon Aug 03 1998 - 20:45:57 NZST