diff --git a/ec2_vol b/ec2_vol
index b0b875e9d02..e6f29e6ba01 100644
--- a/ec2_vol
+++ b/ec2_vol
@@ -149,20 +149,25 @@ def main():
     
     # In future this needs to be more dynamic but combining block device mapping best practices
     # (bounds for devices, as above) with instance.block_device_mapping data would be tricky. For me ;)
-       
+
+    # Use password data attribute to tell whether the instance is Windows or Linux
+
     if device_name is None and instance:
         try:
-            if inst.root_device_type != 'ebs':
+            if inst.get_password_data == '':
                 device_name = '/dev/sdf'
                 attach = volume.attach(inst.id, device_name)
+                while volume.attachment_state() != 'attached':
+                    time.sleep(3)
+                    volume.update()
             else:
-                device_name = '/dev/sdb'
+                device_name = '/dev/xvdf'
                 attach = volume.attach(inst.id, device_name)
                 while volume.attachment_state() != 'attached':
                     time.sleep(3)
                     volume.update()
         except boto.exception.BotoServerError, e:
-            module.fail_json(msg = "%s: %s" % (e.error_code, e.error_message))           
+            module.fail_json(msg = "%s: %s" % (e.error_code, e.error_message))
 
     print json.dumps({
         "volume_id": volume.id,