Hopefully your screen should look like this. Just make sure you select your SD card, and not a connected hard drive.
Once you decompress the file you downloaded, you should write it directly to the SD card. It writes to the physical card, making all of the partitions as needed.
Guu’s auto expanding image looks and sounds amazing! It only went up about half an hour ago, so I haven’t tested it, but it sounds like it’s EXACTLY what you need! Thanks Guu! 