I would fit an internal hard drive, in your VU+ Solo 2, if you have an old SATA hard drive it only takes a few minutes:
If you want to use your USB device then all you need to do is set up the recording path, in your addons, like Neptune Rising.
This will give you an idea:
Code:
https://www.youtube.com/watch?v=LyQgRU-aBzE
Once the recording path is set up, say you want to download an episode of gold rush, a discovery channel program, first you search for the show, go into Neptune rising, select television, then go to the search option, type in gold rush.
Once this is found, select the season, and episode, you want to download, it should then search for available links.
Select a link, and if it's the episode you want, and the quality is good, press stop, or escape, if using a USB keyboard, highlight the stream, then instead of pressing OK, press the menu button, which should now give you the option of downloading.
You can numerous guides, on the internet, on how to make the most out of your Kodi plugin.