Still, the SSD seems like a good fit for static content storage needs. X-rays and such.
HD seem to go up in capacity and remain mostly constant in price. It's the way they are built that determines price, so cramming the most on a platter is the never ending foot race. I just bought a 500 GB SATA high speed drive for $60.
At the last juncture, people said conventional recording had pooped out. Then came vertical recording. We were doing vertical recording way back in the early 80s.
Is suppose if you want to archive store, the optical is what you may want, especially if you want it portable.