diff --git a/scripts/generate_site.py b/scripts/generate_site.py
index 3883f874..4172b93c 100644
--- a/scripts/generate_site.py
+++ b/scripts/generate_site.py
@@ -2001,25 +2001,41 @@ def file_location_items(db: dict) -> list[dict]:
 
 
 def _group_by_manufacturer(db: dict) -> dict[str, dict[str, list]]:
-    """Group files by manufacturer -> console -> files."""
-    manufacturers: dict[str, dict[str, list]] = {}
-    for sha1, entry in db.get("files", {}).items():
-        path = entry.get("path", "")
-        parts = path.split("/")
-        if len(parts) < 3 or parts[0] != "bios":
+    """Group files by manufacturer -> console -> files.
+
+    The database keeps one path per content, and a copy filed elsewhere was
+    on no page of its own: the Channel F BIOS sat under Arcade > FBNeo only,
+    and Fairchild had no system page. Every folder holding a copy lists it,
+    read from the full paths by_path_suffix records.
+    """
+    files = db.get("files", {})
+    bios_dir = Path(str(db.get("bios_dir") or "bios"))
+    places: dict[str, set[tuple[str, str]]] = {}
+    for sha1, entry in files.items():
+        parts = str(entry.get("path", "")).split("/")
+        if len(parts) >= 3 and parts[0] == "bios":
+            places.setdefault(sha1, set()).add((parts[1], parts[2]))
+    for tail, sha1s in db.get("indexes", {}).get("by_path_suffix", {}).items():
+        parts = tail.split("/")
+        if len(parts) < 3 or parts[1].startswith(".") or len(sha1s) != 1:
             continue
-        manufacturer = parts[1]
-        console = parts[2]
-        manufacturers.setdefault(manufacturer, {}).setdefault(console, []).append(entry)
+        if sha1s[0] in files and (bios_dir / tail).is_file():
+            places.setdefault(sha1s[0], set()).add((parts[0], parts[1]))
+    manufacturers: dict[str, dict[str, list]] = {}
+    for sha1, where in places.items():
+        for manufacturer, console in sorted(where):
+            manufacturers.setdefault(manufacturer, {}).setdefault(console, []).append(files[sha1])
     return manufacturers
 
 
 def generate_systems_index(manufacturers: dict) -> str:
     total_mfr = len(manufacturers)
     total_consoles = sum(len(c) for c in manufacturers.values())
-    total_files = sum(
-        len(files) for consoles in manufacturers.values() for files in consoles.values()
-    )
+    # A copy filed under two folders appears on both pages, counted once here.
+    total_files = len({
+        f.get("sha1") for consoles in manufacturers.values()
+        for files in consoles.values() for f in files
+    })
 
     lines = [
         "# Systems",
diff --git a/tests/test_site_system_links.py b/tests/test_site_system_links.py
index 8327ac88..ca568dbe 100644
--- a/tests/test_site_system_links.py
+++ b/tests/test_site_system_links.py
@@ -96,5 +96,32 @@ class OtherSpellingsOfOneSystem(unittest.TestCase):
         self.assertEqual(siterender._system_page_map["commodore-pet"], ("commodore", "PET"))
 
 
+class ACopyIsOnItsOwnFoldersPage(unittest.TestCase):
+    """The database keeps one path per content: the Channel F BIOS was on the
+    Arcade page only, and Fairchild had no system page at all."""
+
+    def test_every_folder_holding_a_copy_lists_it(self):
+        import tempfile
+
+        with tempfile.TemporaryDirectory(dir=REPO_ROOT / "tmp") as tmp:
+            for rel in ("Arcade/FBNeo/sl31253.rom", "Fairchild/Channel F/sl31253.bin"):
+                (Path(tmp) / rel).parent.mkdir(parents=True, exist_ok=True)
+                (Path(tmp) / rel).write_bytes(b"x")
+            db = {
+                "bios_dir": tmp,
+                "files": {"s": {"path": "bios/Arcade/FBNeo/sl31253.rom", "sha1": "s",
+                                "name": "sl31253.rom"}},
+                "indexes": {"by_path_suffix": {
+                    "Arcade/FBNeo/sl31253.rom": ["s"], "FBNeo/sl31253.rom": ["s"],
+                    "Fairchild/Channel F/sl31253.bin": ["s"], "Channel F/sl31253.bin": ["s"],
+                }},
+            }
+            groups = gs._group_by_manufacturer(db)
+        self.assertEqual(sorted(groups), ["Arcade", "Fairchild"])
+        self.assertEqual(list(groups["Fairchild"]), ["Channel F"])
+        # The copy is listed twice and counted once.
+        self.assertRegex(gs.generate_systems_index(groups), r"2 consoles, 1 files? ")
+
+
 if __name__ == "__main__":
     unittest.main()