A few days ago I was talking to my buddy Jim Goldstein and we reminisced about all the old discs that we used to have. Some of those will not even hold a jpg from a 2 MP camera.
Assuming an raw image is 7-35MP nowadays, it is amazing that we used to carry tiny pieces of plastic with as little as 360KB in them.
You know what? I am going to make it easy for you and you only need to know the size of the disk, getting the actual number of photos that would fit in introduces way to many variables.