diff --git a/drivers/ISOSR.py b/drivers/ISOSR.py
index eb471e22b..355e4c9ec 100755
--- a/drivers/ISOSR.py
+++ b/drivers/ISOSR.py
@@ -119,7 +119,7 @@ def _loadvdis(self):
             return
 
         for name in filter(is_image_utf8_compatible,
-                util.listdir(self.path, quiet = True)):
+                util.listdir(self.path, quiet = True, depth=10)):
 	    fileName = self.path + "/" + name
             if os.path.isdir(fileName):
                 util.SMlog("_loadvdis : %s is a directory. Ignore" % fileName)
diff --git a/drivers/util.py b/drivers/util.py
index 888cbdb98..8a9e85b7b 100755
--- a/drivers/util.py
+++ b/drivers/util.py
@@ -208,8 +208,8 @@ def pread3(cmdlist, text):
     SMlog("  pread3 SUCCESS")
     return stdout
 
-def listdir(path, quiet = False):
-    cmd = ["ls", path, "-1", "--color=never"]
+def listdir(path, quiet=False, depth=1):
+    cmd = ["find", path, "-maxdepth", str(depth)]
     try:
         text = pread2(cmd, quiet = quiet)[:-1]
         if len(text) == 0: