EDIT: Never mount disks manually in LMCE, you will screw up its auto discovery mechanism (orionsune: yes, I know unless you know exactly what you are doing and can compensate! but that is clearly not the case here)
That is not what Zaerc meant, re-read his comment.
He is not saying move your files to the core HDD, he is saying move them to the correct folder on your NTFS drive.
Have you read what is meant by - use LMCE folder structure? It means that there is a set folder structure that LMCE uses to store all its media. I won't explain why, you can find that easily enough on the wiki, except to say it allows you to transparently combine all your media from different sources in different MDs as one single simple folder structure.
LMCE 0710 can happily mount and read/write NTFS, so don't worry about that.
You will find that as you didn't already have the correct LMCE folder structure on your NTFS HDD, LMCE has now created one for you:
LMCE will only look in those last folders for its media and ignore anything else on the HDD. There are other ways of doing this in LMCE - don't use them! This is the best way of doing it.
Simply move your video files under public|video, audio files under public|audio, and so on.
Either wait for LMCE scan them itself, or manually trigger a scan in the admin console.
PS - now you have copied at least some of your media to the core HDD, they will be in the media database, and so when you move them to the correct location, you will end up with duplicate media. You need to use the admin web site, Media File Sync menu - find the ones on the core and delete them using the web site (NOT KDE) to ensure that you clean up the database at the same time.