Are you sure you haven't accidentally allocated audio files there?
Which ones? It's not Pro Tools' fault.
You must have some serious sample-libraries in there.
Which ones?
It's not Pro Tools' fault.
How did you install the EastWest stuff? Because it prompts you to choose an installation directory for all the samples.
Yeah, there should be a way to do that, sample libraries are best running from a dedicated drive, not running from the system-drive. The developers wouldn't make it so that you couldn't do that.