SonicOS 7 provides the DEVICE | Settings > Storage page showing the status of M.2 storage modules on the firewall, including the secondary storage module, if installed. Storage modules are supported on TZ, NSa and NSsp 13700 firewalls. The storage module resides in a small compartment on the bottom of the firewall.
Module usage statistics are displayed and the file names of the stored files can be viewed on the Settings and Files screens.
Settings screen:
Files screen: