Cloud computing has gained a lot of hype in the current world of I.T. Cloud computing is said to be the next big thing in the computer world after the internet. Cloud computing is the use of the Internet for the tasks performed on the computer and it is visualized as the next- generation architecture of IT Enterprise. The ‘Cloud’ represents the internet. Cloud computing is related to several technologies and the convergence of various technologies has emerged to be called cloud computing. In comparison to conventional ways Cloud Computing moves application software and databases to the large data centers, where the data and services will not be fully trustworthy. In this article, I focus on secure data storage in cloud; it is an important aspect of Quality of Service. To ensure the correctness of users’ data in the cloud, I propose an effectual and adaptable scheme with salient qualities. This scheme achieves the data storage correctness, allow the authenticated user to access the data and data error localization, i.e., the identification of misbehaving servers..