Have you looked at fdisk -l /dev/sda? (If the partition is on your first hard drive, sdb for second, etc.)
When you state that you "only see" ~19Mb of files, how were you "looking?" If, for example, the ext4 fs is your root file system, it would contain a lot of file owned by "root" to which you would not, normally, have access. Thus they would not be displayed in, for example, a ls of your home directory.
You could, perhaps, do a sudo find / -size 2G to list all files of size 2Gb or more (or 2M for 2 Mb or more, etc.) to see if you have some exceptionally large files on your drive.
You might want to look at the output of mount. Perhaps you've linked space on that partition to some other location so it doesn't show up when you look.
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