Quote Originally Posted by MJKearney View Post
There's lots of other data being stored besides the list you mentioned. Download the app called DiskUsage. It shows a nice, very graphical representation of your storage. You'll notice the system data folder, which you can't access to see its contents. However, it will show you its size. Perhaps that is the data amount that you are missing. There is also a lot of data in the Android folder and its sub-folders. You can drill down into that to see the specifics of what's in there.

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I registered just to thank you for this post. DiskUsage is now my favourite apps of the month! I made a post on stackexange pretty much answering the same question, but with much more details.