Not exactly Cubase, but I’m using it for EW Play libraries. Some of EW libraries like Hollywood Strings and Brass are quite big in size, so I’ve used the Junction thing to move parts of those libraries to a small SSD. I have just one mic position from those libraries on an SSD, while the rest is on another HD, where EW Play thinks I have everything in.
I went with this method for my setup because it was recommended over using shortcut at EW forum. I can’t remember exactly why shortcut was not good enough, to be honest. Here’s a description of the difference between a symbolic link and a shortcut I found on the net :
A “shortcut” is effectively a file that holds the filepath of another file. When you read it, you read a specially formatted file that tells you where to look next. If your application doesn’t listen, and simply reads the file verbatim, then you don’t follow it. A symbolic link is filesystem-level, it’s the filesystem itself that holds the “true” path to the data and when you attempt to access it, you retrieve the data pointed to.
Since thinkingcap says a shortcut will work with Cubase, I think you should try that one first.