Internal and External Memory Combine

[WCW1]

I have a MOTO X Pure with Marshmallow. I put a 64GB SD card and asked if I wanted Internal or External Memory and I selected it to be Internal Memory. It gave me a message that SD cards are slower than internal memory and did I want to proceed. I said YES and it formatted and installed the SD card. So my question is should my memory show up as one partition when plugged into USB on my computer? It shows SD card and Device memory. Did it not combine the SD card and Internal memory as they are both readable in my computer? Not much on the SD card.