In an appropriately configured RAID array, a single bad block on a single drive can be recovered completely via the redundancy encoded across the RAID set. In a non-RAID application, it may be important for a disk drive to go to great lengths to successfully read a problematic storage block, even if it takes several seconds. For example, some NAS versions of drives support a command extension to allow extended error recovery to be disabled. The hard disk drives with "NAS" in their names are functionally similar to other drives but may have different firmware, vibration tolerance, or power dissipation to make them more suitable for use in RAID arrays, which are often used in NAS implementations. Potential benefits of dedicated network-attached storage, compared to general-purpose servers also serving files, include faster data access, easier administration, and simple configuration. From the mid-1990s, NAS devices began gaining popularity as a convenient method of sharing files among multiple computers. They typically provide access to files using network file sharing protocols such as NFS, SMB, or AFP. Network-attached storage removes the responsibility of file serving from other servers on the network. NAS systems are networked appliances that contain one or more storage drives, often arranged into logical, redundant storage containers or RAID.
It is often manufactured as a computer appliance – a purpose-built specialized computer. NAS is specialized for serving files either by its hardware, software, or configuration. Network-attached storage ( NAS) is a file-level (as opposed to block-level storage) computer data storage server connected to a computer network providing data access to a heterogeneous group of clients.
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