This chapter provides an overview of big data storage technologies. It is the result of a survey of the current state of the art in data storage technologies in order to create a cross-sectorial technology roadmap. This chapter provides a concise overview of big data storage systems that are capable of dealing with high velocity, high volumes, and high varieties of data. It describes distributed file systems, NoSQL databases, graph databases, and NewSQL databases. The chapter investigates the challenge of storing …