[rewind]

I have a USB backup of all my media, and when I connect/mount the drive, Kodi always adds it to the sources list under Media Settings.  When I make changes to my primary source and "update library," the USB drive is always scanned.  How can I force only scanning/listing of files under path /home/me/Primary ?

Here is my ~/.kodi/userdata/sources.xml file:

xml:
<sources>

    <programs>

        <default pathversion="1"></default>

    </programs>

    <video>

        <default pathversion="1"></default>

        <source>

            <name>Movies</name>

            <path pathversion="1">/home/me/Primary/Video/Movies/</path>

            <allowsharing>true</allowsharing>

        </source>

        <source>

            <name>Television</name>

            <path pathversion="1">/home/me/Primary/Video/Television/</path>

            <allowsharing>true</allowsharing>

        </source>

    </video>

    <music>

        <default pathversion="1"></default>

        <source>

            <name>Music</name>

            <path pathversion="1">/home/me/Primary/Music/</path>

            <allowsharing>true</allowsharing>

        </source>

    </music>

    <pictures>

        <default pathversion="1"></default>

    </pictures>

    <files>

        <default pathversion="1"></default>

    </files>

</sources>