The Cached-Loading option with a self-contained Software Package and concrete definition of the version information can be too restrictive for some devices. E.g., if new software should be installed. For this use case the FileSystem based Loading provides an open structure of files and directories where a Client can read and write. These files could be e.g., configuration, setup files or recipes.

Note: The FileSystem exposed in the AddressSpace is not necessarily congruent with the actual file system of the device.

Note: Since FileSystem based Loading supports adding new software and updating multiple parts with individual versions, there is no standard way to expose the current version number(s) of the system. Therefore, a Software Update Client requires additional vendor-specific information, or other companion specifications must define a more specific use. If the additional flexibility of FileSystem based Loading is not required, Cached-Loading should be preferred.

The purpose of the directories and files is not part of this specification. It is necessary, that Client and the Server know it. Other companion specifications could add this definition for specific types of devices. If accessed by a Software Update Client, the FileSystem root can be used to store and install the files.

For FileSystem based Loading the FileSystemLoadingType is used, which is described in 8.4.6.