Dear Jack,
Things seem running now after I've:
1. modified the dev param according to cdrecord -scanbus and
2. ran mkisofs.
But I've another problem now, I can mount the cd-R and read the content...
I've add the dev by using sysadmin and I've run cdrecord but it said /dev/cd0 not found.
p.s. I've tried to put a sco system cd in the cd rom & I can mount & read the cd.