Using tools like wget or DownThemAll! , users can scrape an entire directory to ensure they have a complete, verified set.
http://example.com/roms/mame/
Index of /roms/mame/ Parent directory 1942.zip 1943.zip sf2.zip mslug.zip neogeo.zip ... index of mame roms
Want to see all Neo-Geo games in the index? Using tools like wget or DownThemAll