check_boot_flag(): Open device in binary mode

[grml2usb.git] / grml2usb

diff --git a/grml2usb b/grml2usb
index eaeba08..75fcd3e 100755 (executable)
--- a/grml2usb
+++ b/grml2usb
@@ -389,7 +389,7 @@ def check_boot_flag(device):
     except ImportError as e:
         logging.debug("could not import parted, falling back to old bootflag detection")
 
-    with open(boot_dev, 'r') as image:
+    with open(boot_dev, 'rb') as image:
         data = image.read(520)
         bootcode = data[440:]
         gpt_data = bootcode[70:80]