^ this just don't use Shield option. Though I guess you can now...
I have the game installed and its not 15gb. Its registered as 11.2 GB (12,127,473,664 bytes). It would appear you are downloading the game. Not a patch! There has been no patches at that size for the game. You will need to contact EA if your drives are not seeing disc 2. This could be a hardware issue on the customers side. As many others are not having the issue and are playing fine. (Note I am not counting D2D players)
Whoa whoa whoa... 13.8GB patch? I don't think any game in the history of gaming has had a 13.8GB patch.
Like my partner in crime said... sounds like you're trying to download the whole game. But even that's too big.
I am sure one day in the future there will be, maybe Mass Effect 10 or something.