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Network Attached Storage (NAS) is a term used to describe a complete storage system which is designed to be attached to a traditional data network.

This differentiates Network Attached Storage devices from SAN's (Storage Area Networks). A SAN is a separate network to which storage devices are attached.

In most cases, Network Attached Storage is less expensive to purchase and less complex to operate than a Storage Area Network. However, a SAN can provide better performance and a larger range of configuration options.