Draytek Vigor2830 Series User Manual page 289

Access Rule
Before you click OK, you have to insert a USB storage disk into the USB interface of the
Vigor router. Otherwise, you cannot save the configuration.
It determines the authority for such profile. Any user, who uses
such profile for accessing into USB storage disk, must follow
the rule specified here.
File – Check the items (Read, Write and Delete) for such
profile.
Directory –Check the items (List, Create and Remove) for such
profile.
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Vigor2830 Series User's Guide