diff --git a/app.py b/app.py
index 7aabbe8..92e4abb 100644
--- a/app.py
+++ b/app.py
@@ -913,27 +913,19 @@ def delete_remote(tid):
 
 
 def test_remote(tid):
-    import tempfile, os as _os
     remote = _remote_name(tid)
     # 1. Verbindung prüfen
-    r = _rclone('lsd', f'{remote}:', timeout=20)
+    r = _rclone('lsd', f'{remote}:', timeout=15)
     if r.returncode != 0:
         err = r.stderr.strip().splitlines()[-1] if r.stderr.strip() else 'Verbindung fehlgeschlagen'
         return False, f'Verbindung: {err}'
-    # 2. Schreibzugriff prüfen: temporäres Verzeichnis + Datei, dann wieder löschen
+    # 2. Schreibzugriff prüfen: Testverzeichnis anlegen + sofort löschen
     test_dir = f'{remote}:.picopy_writetest'
-    with tempfile.NamedTemporaryFile(mode='w', suffix='.tmp', delete=False) as tf:
-        tf.write('PiCopy write test')
-        tmp_path = tf.name
-    try:
-        rw = _rclone('copy', tmp_path, test_dir, timeout=20)
-        if rw.returncode != 0:
-            err = rw.stderr.strip().splitlines()[-1] if rw.stderr.strip() else 'Schreiben fehlgeschlagen'
-            return False, f'Kein Schreibzugriff: {err}'
-        _rclone('purge', test_dir, timeout=10)
-    finally:
-        try: _os.unlink(tmp_path)
-        except Exception: pass
+    rw = _rclone('mkdir', test_dir, timeout=15)
+    if rw.returncode != 0:
+        err = rw.stderr.strip().splitlines()[-1] if rw.stderr.strip() else 'Schreiben fehlgeschlagen'
+        return False, f'Kein Schreibzugriff: {err}'
+    _rclone('rmdir', test_dir, timeout=10)
     return True, ''
 
 
diff --git a/version.txt b/version.txt
index 9cc0a9d..99f7422 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-1.0.38
\ No newline at end of file
+1.0.39
\ No newline at end of file