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One of the most important functions of a server operating system is to share resources with other network users. The most common resource that’s shared is the server’s file system — organized disk space that a server must be able to share (in whole or in part) with other users. In effect, those users can treat the server’s disk space as an extension of their own computers’ disk space.

The server operating system allows the system administrator to determine which portions of the server’s file system to share.

Although an entire hard drive can be shared, it isn’t commonly done. Instead, individual folders are shared. The administrator can control which users are allowed to access each shared folder.

Because file sharing is the reason why many network servers exist, server operating systems have more sophisticated disk management features than are found in desktop operating systems. For example, most server operating systems can manage two or more hard drives as though they were a single drive. In addition, most can create a mirror — an automatic backup copy of a drive — on a second drive.