Rose:
Your HP desktop is equipped with a 256 GB SSD (actual capacity about 237 GB) which is your boot drive (C
. Also installed is a 3 TB HDD which is designed to be used for most of your programs and whatever other data you desire to be installed on that secondary drive. I don't know whether your C: boot drive (the SSD) contains programs/data you installed (I suspect it does) or whether it came from the factory with all that data installed. So the screenshot you submitted correctly refers to the two drives installed in your HP desktop PC.