Solid state drives are very different from the legacy HDD’s, but not just in a technology sense. HDD’s had pretty much hit their development peak when SSD’s started to take off. They have since seen a rebirth with much larger capacities and new technologies keeping them well ahead of the SSD variety of storage. This was more about capacity than anything else, whereas SSD’s have the untapped development edge to their name and having non storage manufacturers developing the technology.