DAS

Direct-attached storage (DAS) refers to a digital storage system directly attached to a server or workstation, without a storage network in between. Mainly used to differentiate non-networked storage from SAN and NAS.

SAN

In computing, a storage area network (SAN) is an architecture to attach remote computer storage devices (such as disk arrays, tape libraries and optical jukeboxes) to servers in such a way that, to the operating system, the devices appear as locally attached, SANs are still uncommon outside larger enterprises. By contrast to a SAN, network-attached storage (NAS) uses file-based protocols such as NFS or SMB/CIFS where it is clear that the storage is remote, and computers request a portion of an abstract file rather than a disk block.

NAS

Network-attached storage (NAS) is a file-level computer data storage connected to a computer network providing data access to heterogeneous network clients