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Network Attached Storage (NAS) systems consist of a externally powered unit consisting of one or more hard disks that have an embedded operating system, with a defined area on the drive(s) for data storage. NAS devices are normally connected directly to the network through a standard network cable.
Data recovery from NAS devices requires an understanding of the file system structures. The operating system of choice for most NAS boxes is Linux as it offers a good network operating system and reliable file systems. Most of all, the Linux operating systems are very cheap compared to other server software, often free, bring the overall cost of the units right down and available to all.
RAID levels vary from between manufacturers, some use proprietary RAID based systems such as Infrant's X-RAIDtm system
Most NAS boxes have a 'front end' where administrators can set up access parameters, users and shares usually through a web interface.
What makes NAS different from SAN (Storage Area Network) is that SAN does not normally have a built-in operating system and is basically a box that contains a number of hard disk drives that are usually connected directly to a host computer using a RAID controller card through SCSI, SAS, USB, Fire Wire, eSATA, etc
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NAS equipment is used mainly as a central network storage area where shares can be set up so that different users or departments can access the data they need for data recovery. Many modern NAS boxes also contain built-in web servers and FTP servers and so can be used as stand-alone systems for web or file access separated from the main network helping security. |
NAS is NOT an alternative for backup. Computer data should be backed up using a recognised backup policy.