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D ISK ATTACHMENT Network-Attached Storage D ISK ATTACHMENT Computers access disk storage in two ways: 1) Host attached via an I/O port 2) Network attached via a network connection D ISK ATTACHMENT It is a device which has a special purpose storage system that is access remotely over a data network (LAN) . rather Than over a local connection (such as a bus) -> Remotely attaching to file systems D ISK ATTACHMENT Consist of : 1- Processor 2- memory 3- USB port 4- do not have a keyboard or display D ISK ATTACHMENT D ISK ATTACHMENT D ISK ATTACHMENT They typically provide access to files using network file sharing protocols such as NFS, SMB/CIFS, or AFP. NFS and CIFS are common protocols NFS (network file system) for UNIX system CIFS (common internet file system) for windows system This two protocols is type of : Remote Procedure Call (RPC) D ISK ATTACHMENT NAS connect to network via internet such as TCP/IP (Transmission Control Protocol/Internet Protocol) D ISK ATTACHMENT : NAS not provide just storage data but backing up and sharing files across your network. NAS as a convenient and easy method of sharing files among multiple pc’s computers NAS allows greater sharing of information especially between different operating systems such as Unix and Mac Advantages : faster data access , easier control, and simple implementation D ISK ATTACHMENT : NAS systems contain one or more hard disks, often arranged into logical, redundant storage containers or RAID arrays. NAS provides both storage and a file system .File System managed by NAS NAS is easier to do than other storage access method like a Storage area network. D ISK ATTACHMENT