diff --git a/tools/re-capture/name_block_bases.py b/tools/re-capture/name_block_bases.py
index f211439b..b982a22a 100644
--- a/tools/re-capture/name_block_bases.py
+++ b/tools/re-capture/name_block_bases.py
@@ -194,7 +194,19 @@ def main():
     from unit_substructures import pak_entries
     import unitgroup as _U
     disc = set()
-    for pk in sorted(glob.glob('/work/sylph_extract/**/*.pak', recursive=True)):
+    # 🔴 This globbed `/work/sylph_extract/**/*.pak`, a path that exists nowhere
+    # since `/work` became a clone. The glob matched nothing, so this section
+    # reported `0` disc names and an empty table WITHOUT an error — while the
+    # committed artefact, generated back when the path existed, shows 13 450.
+    # The disc is required for this section, so a missing disc is an error.
+    disc_root = os.environ.get('SYLPHEED_DISC')
+    if not disc_root or not os.path.isdir(os.path.join(disc_root, 'dat')):
+        sys.exit('this report needs the disc: set $SYLPHEED_DISC to an extracted '
+                 'disc root (the directory holding dat/)')
+    paks = sorted(glob.glob(os.path.join(disc_root, '**', '*.pak'), recursive=True))
+    if not paks:
+        sys.exit(f'no .pak files under $SYLPHEED_DISC={disc_root}')
+    for pk in paks:
         for _h, b in pak_entries(pk):
             if b[:4] != b'IDXD':
                 continue