From 79796fe0719a087a5eb33ebbd9e8962c2a42933d Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 19 Jan 2016 10:04:42 +0530
Subject: [PATCH] ...

---
 src/calibre/devices/winusb.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/devices/winusb.py b/src/calibre/devices/winusb.py
index 0fa149ac57..a8f56a3138 100644
--- a/src/calibre/devices/winusb.py
+++ b/src/calibre/devices/winusb.py
@@ -775,7 +775,7 @@ def get_drive_letters_for_device(usbdev, storage_number_map=None, debug=False):
                 ans['readonly_drives'].add(dl)
         except WindowsError as err:
             if debug:
-                prints('Failed to get readonly status for drive: %s' % dl)
+                prints('Failed to get readonly status for drive: %s with error: %s' % (dl, as_unicode(err)))
 
     return ans