1. mount CDROM
# mkdir /mnt/cdrom
# echo "/dev/cd0a /mnt/cdrom cd9660 ro,nodev,nosuid,noauto 0 0" >> /etc/fstab
#mount /mnt/cdrom

2. mount iso
# vnconfig svnd0 /usr/local/share/4.1.iso
# mount -t cd9660 /dev/svnd0c /mnt/cdrom

3. mount usb
# mkdir /mnt/usb
# mount_msdos /dev/sd0i /mnt/usb