diff --git a/src/calibre/devices/misc.py b/src/calibre/devices/misc.py
index 2687517bb0..7ec38af774 100644
--- a/src/calibre/devices/misc.py
+++ b/src/calibre/devices/misc.py
@@ -234,6 +234,8 @@ class TREKSTOR(USBMS):
     VENDOR_NAME = 'TREKSTOR'
     WINDOWS_MAIN_MEM = WINDOWS_CARD_A_MEM = ['EBOOK_PLAYER_7',
             'EBOOK_PLAYER_5M', 'EBOOK-READER_3.0', 'EREADER_PYRUS']
+    SUPPORTS_SUB_DIRS = True
+    SUPPORTS_SUB_DIRS_DEFAULT = False
 
 class EEEREADER(USBMS):
 
diff --git a/src/calibre/devices/usbms/deviceconfig.py b/src/calibre/devices/usbms/deviceconfig.py
index bc7dc116e2..2aac9fb769 100644
--- a/src/calibre/devices/usbms/deviceconfig.py
+++ b/src/calibre/devices/usbms/deviceconfig.py
@@ -30,6 +30,8 @@ class DeviceConfig(object):
     SUPPORTS_SUB_DIRS = False
     SUPPORTS_SUB_DIRS_FOR_SCAN = False # This setting is used when scanning for
                                        # books when SUPPORTS_SUB_DIRS is False
+    SUPPORTS_SUB_DIRS_DEFAULT = True
+
     MUST_READ_METADATA = False
     SUPPORTS_USE_AUTHOR_SORT = False
 
@@ -57,7 +59,7 @@ class DeviceConfig(object):
         c = Config('device_drivers_%s' % name, _('settings for device drivers'))
         c.add_opt('format_map', default=cls.FORMATS,
                 help=_('Ordered list of formats the device will accept'))
-        c.add_opt('use_subdirs', default=True,
+        c.add_opt('use_subdirs', default=cls.SUPPORTS_SUB_DIRS_DEFAULT,
                 help=_('Place files in sub directories if the device supports them'))
         c.add_opt('read_metadata', default=True,
                 help=_('Read metadata from files on device'))