In Raspberry Pi B model by default is limiting the output amperage. We can trick this behavior editing the config file: vi /boot/config.txt Add the following lines: safe_mode_gpio=4 max_usb_current=1 Reboot the raspberry and now you can plug the HDD in the usb port.
Unfortunately, at the time of writing this post the latest version available from Raspbian repositories is 1.3.3. And you may not use other repositories since they will probably not provide packages for ARM devices such as the Raspberry PI. There are different reasons for updating Deluge to the latest version. One of them is that 1.3.3 does not support Magnet links, which is a very common way of loading in torrents to the client.