That is very strange. I don't see any errors preventing Minion from listing your available drives.
You can try adding the following above the </minion> line in your minion.xml file
Code:
<drive-configs never-ask-about-scanning="true">
</drive-configs>
So it would look like this...
Code:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<minion>
<config-version>2</config-version>
<version>2.1.4-beta</version>
<build>3d139c5f76adfb922233fec1ec5480d2069af109</build>
<libs-build>febb5fb6d74ed17b1ee031472f25a7fdddf86837</libs-build>
<client>
<concurrent-updates>2</concurrent-updates>
<game-scan-depth>4</game-scan-depth>
<position height="688.0" width="1204.0" x="183.0" y="141.0"/>
</client>
<user>
<ga-user-id>26636669-dd9f-42b3-a3ce-228a8436830f</ga-user-id>
<login-id>Guest</login-id>
</user>
<game-configs never-ask-about-scanning="true">
<game-config game-id="WOW" scannable="false"/>
<game-config game-id="ESO" scannable="true"/>
</game-configs>
<drive-configs never-ask-about-scanning="true">
</drive-configs>
</minion>
Then close (force quit if needed) and start Minion again.
If you're not sure how to edit the file I've attached a modified minion.xml. Just download the file and replace it with the one in your ~/.minion directory.
Please let me know if this works for you, if you still have trouble please post your new minion log file as it may have some new and helpful errors for me.