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A NAS unit is a computer connected to a network that provides only file-based data storage services to other devices on the network. Although it may technically be possible to run other software on a NAS unit, it is usually not designed to be a general-purpose server.
The above translates into different implementations for different uses. Here are some examples. An Internet service provider which provides network access via common modem or modem-like devices (be it PSTN, DSL, cable or GPRS/UMTS) can have one or more NAS (network access server) devices which accept PPP, PPPoE or PPTP connections, checking credentials and recording accounting data via back ...
A storage area network (SAN) or storage network is a computer network which provides access to consolidated, block-level data storage.SANs are primarily used to access data storage devices, such as disk arrays and tape libraries from servers so that the devices appear to the operating system as direct-attached storage.
Typical DAS featuring USB and (legacy) Firewire connectors Typical NAS using ethernet for main connectivity. Direct-attached storage (DAS) is digital storage directly attached to the computer accessing it, as opposed to storage accessed over a computer network (i.e. network-attached storage).
Home servers often act as network-attached storage (NAS) providing the major benefit that all users' files can be centrally and securely stored, with flexible permissions applied to them. Such files can be easily accessed from any other system on the network, provided the correct credentials are supplied.
NAS devices are normally listed either in Category:Server appliance or its subcategory Category:Home servers. In some cases, Category:Server hardware may be more appropriate. Companies which sell NAS devices or software for them should normally be listed in Category:Computer storage companies.