did u mount that harddisk ? if so u need to unmount it or u wont see any partitions from it.
u can use dhclient which is installed to use dhcp. if u wanna connect to a ap from cli ,
u can use wpa_passphrase and wpa_supplicant .
i posted how to use those in anohter post so i wont double it, u can check the forums how to use or pm me