There were many factors that prevented early SSDs from being a viable replacement to platter drives, MTBF, speed, capacity and of course cost being the most prominent. Since that time we have seen an explosion of manufacturers, capacities, NAND technology advancements and a historic plummet in pricing. Now we're looking at the latest in the small form mSATA and M.2 SSDs from Samsung, the 850 EVO versions.