Dell also offers both network attach storage nd peripheral storage. By offering "a comprehensive solutions, including portfolio of advanced storage network-attached storage storage area networks storage, disk and tape backup systems direct-attached and removable disk backup," data can be stored an transitioned over to a new PCor network unit at the. end of the prior unit's life cycle. The diversity in the storage PowerVaultTM, Dell EqualLogic options between Dell and Dell / EMC storage systems caters to a wide variety of target segments. The options vary based on use modularity, scalability, encryption options, and backup storage solutions 100 In 1994, both Dell and rival HP entered the network and server markets. Throughout the 1990s, Dell expanded their data center offerings to an enterprise solution utilizing the high-end, fiber channel-based Power VaultTM 650F storage subsystem. "" 10 In 2004 Dell led a pioneering effort to develop the first Disk Data Format (DDF). , a first attempt at a corporate data center server storage solution. By staying at the forefront of the industry and focusing on ease of use, Dell maintains leadership position in the market.