(VIM is the acronym of virtualimagemanager. It is a network hard disk computer integrated system based on iSCSI protocol. VIM transmits the local physical hard disk on the server to each VIM workstation through tcp/ip network to form an independent virtual hard disk, which is used to store the operating system, personalized data, configuration and application programs of each VIM workstation. However, for users, it is like operating the local physical hard disk)