add image setting

Author: tarTech23

articles/defender-for-iot/organizations/ot-deploy/install-software-ot-sensor.md

@@ -93,9 +93,12 @@ This procedure describes how to install the Defender for IoT software you'd down
 
         - DVDs: First burn the software to the DVD as an image
         - USB drive: First make sure that you’ve created a bootable USB drive with software such as [Rufus](https://rufus.ie/en/), and then save the software to the USB drive. USB drives must have USB version 3.0 or later.
+        - Make sure you select the DD image mode setting, for example:
+
         :::image type="content" source="media/rufus-4-4-dd-image-mode.png" alt-text="screenshot of the DD image settings":::
 
         :::image type="content" source="media/rufus-4-4-drive-properties.png" alt-text="screenshot of the drive properties":::
+
         Your physical media must have a minimum of 4-GB storage.
 
     - **Virtual mount** – use iLO for HPE appliances, or iDRAC for Dell appliances to boot the ISO file.