A data storage device is used for recording (storing) information (data). There are 3 types of storage system that fits your requirement: Network Attached Storage (NAS), Direct Attached Storage (DAS) and Storage Area Network (SAN). A Network-Attached Storage (NAS) device is a server that is dedicated to doing nothing more than file sharing. Direct Attached Storage (DAS) is digital storage that is attached directly to a computer or a server. SAN (Storage Area Network) is a high-speed network of storage devices that also connects those storage devices with servers.