挂接光驱
mount -t cd9660 /dev/acd0 /cdrom
卸载光驱
umount -f /cdrom
挂接USB
mount -t msdos /dev/da0s1 /mnt/usb
卸载USB
umount /dev/da0s1
挂接光驱
mount -t cd9660 /dev/acd0 /cdrom
卸载光驱
umount -f /cdrom
挂接USB
mount -t msdos /dev/da0s1 /mnt/usb
卸载USB
umount /dev/da0s1