I own a 2TB HDD, and I've been thinking of buying an SSD. I know that SSDs have relatively low storage capacity, but make up for it by being much faster. So I'd probably want to put games with long load times on the SSD. 

That said, some patches are huge because they unnecessarily contain a ton of stuff that's already in the game itself. If a patch is too big to be installed on the SSD but the game itself, once patched, wouldn't be, would I still be screwed or could I use my 2TB HDD to hold some of the space temporarily?