The most important goal of Distributed Data Storage schemes in Wireless Sensor Networks is to efficiently distribute data across the WSN. Distributed data storage can play a vital role in improving data availability, security, energy efficiency and network lifetime of wireless sensor networks. Many researchers have been proposed various techniques to store data in a distributed manner. This paper describes a survey on distributed data storage schemes in Wireless Sensor Networks. We have classified these schemes into mainly two categories namely fully distributed data storage [FDDS] and data-centric storage [DCS]. Then, these schemes are further classified into four categories under the constraints topology, security, load-balancing and reliability. Advantages and disadvantages of each schemes also studied and we made the comparison of each schemes with different constraints.