From 1118d338e0410fa04cd9f770b9cad31b105abfa1 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Fri, 1 May 2009 16:13:38 -0700
Subject: [PATCH] IGN:...

---
 src/calibre/debug.py                | 1 +
 src/calibre/devices/usbms/device.py | 2 +-
 src/calibre/devices/usbms/driver.py | 4 ----
 3 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/src/calibre/debug.py b/src/calibre/debug.py
index 9dee6b2a86..35fc615b58 100644
--- a/src/calibre/debug.py
+++ b/src/calibre/debug.py
@@ -117,6 +117,7 @@ def debug_device_driver():
             print 'Trying to open device...'
             d = dev()
             d.open()
+            print 'Main memory:', repr(d._main_prefix)
             print 'Total space:', d.total_space()
             break
 
diff --git a/src/calibre/devices/usbms/device.py b/src/calibre/devices/usbms/device.py
index ec021edb3b..660953e68c 100644
--- a/src/calibre/devices/usbms/device.py
+++ b/src/calibre/devices/usbms/device.py
@@ -106,7 +106,7 @@ class Device(_Device):
 
     @classmethod
     def _windows_space(cls, prefix):
-        if prefix is None:
+        if not prefix:
             return 0, 0
         win32file = __import__('win32file', globals(), locals(), [], -1)
         try:
diff --git a/src/calibre/devices/usbms/driver.py b/src/calibre/devices/usbms/driver.py
index 21a5da77cd..fdb553f15b 100644
--- a/src/calibre/devices/usbms/driver.py
+++ b/src/calibre/devices/usbms/driver.py
@@ -42,10 +42,6 @@ class USBMS(Device):
                         report_progress=report_progress)
 
     def get_device_information(self, end_session=True):
-        """
-        Ask device for device information. See L{DeviceInfoQuery}.
-        @return: (device name, device version, software version on device, mime type)
-        """
         return (self.__class__.__name__, '', '', '')
 
     def books(self, oncard=False, end_session=True):