: A 1-to-1 digital replica of an optical disc. It preserves the exact file system, bootloader, and directory structure required for system deployment . Primary Use Cases
: Acts as a bootable recovery tool to repair or troubleshoot a system if the primary OS fails.
: Indicates the file contains core operational components rather than just business data. This often includes the underlying operating system (frequently SUSE Linux Enterprise or Red Hat) and the primary S4CORE component needed to initialize the environment.