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