opkg update
opkg install kmod-fs-isofs
opkg install usbutils
[REPLUG]
lsusb
mkdir -p /mnt/cdrom; mount /dev/sr0 /mnt/cdrom; ls /mnt/cdrom
note: some platforms need one or some of
kmod-usb2
kmod-usb3
kmod-usb-ehci
kmod-usb-ohci
kmod-usb-xhci
funny your hard drive work without at least one of them... maybe my ignorance or perhaps list-installed wont show built-ins or something.