Cracked me up, especially after the hours of waiting. When you start the scan it says there is potential malware or unwanted programs but makes you wait until the scan is complete to show them to you.
I've had this backup drive for quite a while so was a bit concerned.
When I saw it was the Z4Root.apk from the DroidX I couldn't stop laughing.
Seriously, why would Defender consider it a threat. This isn't Linux or Unix, or is it under the covers ???