Comment 1 for bug 1237673

The set of media roots is configured through gsettings:

    $ gsettings get com.canonical.mediascanner media-roots
    ['user:download', 'user:music', 'user:pictures', 'user:videos']

As a work around, you can update this setting using "gsettings set" to add the URL of the folder in /userdata to have it scan that location too (it needs to be a URL rather than a plain path, so don't forget the "file:///" bit).

If we end up having devices configured for people to store data outside of their home directory, then it would make sense to change this setting accordingly. However, if this is just an artefact of the current images, then it is probably best to leave things as they are.