diff --git a/src/main.rs b/src/main.rs
index 7a2d0b9..93df054 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1945,6 +1945,24 @@ fn watch_files(
         let mut last_full_scan = SystemTime::now();
         let mut scan_count = 0u64;
 
+        // Initial availability sweep before the loop's first sleep so
+        // /libraries reports the truth from the very first request,
+        // rather than the optimistic Online default that
+        // new_health_map seeds. Without this, an unmounted share would
+        // appear online for up to WATCH_QUICK_INTERVAL_SECONDS (default
+        // 60s) after boot. Same probe logic as the per-tick gate
+        // below; no ingest runs here, just the health update + log.
+        for lib in &libs {
+            let context = opentelemetry::Context::new();
+            let had_data = exif_dao
+                .lock()
+                .expect("exif_dao poisoned")
+                .count_for_library(&context, lib.id)
+                .map(|n| n > 0)
+                .unwrap_or(false);
+            libraries::refresh_health(&library_health, lib, had_data);
+        }
+
         loop {
             std::thread::sleep(Duration::from_secs(quick_interval_secs));