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Earlier this year, EMC introduced a new product aimed at a market they labeled content addressed storage. This type of storage is a repository for data that needs to be archived but also needs to be handy for occasional access. EMC's brainchild Centera is filled with several cheap ATA drives that give a customer up to 19.2TB per cabinet. On the software side, with CentraStor, EMC uses a proprietary content-addressing scheme that assigns a unique address to the item, one that stays with that content permanently. The complaint is that SANs and NAS are already 2 separate storage architectures that will merge over time. Centera's proposal involves a whole new architecture that must be managed separately.