I bought my N810 about 2 months ago. I install a bunch of apps and my memory goes down. I delete the apps but its still the same. I install Debian in there (IMG on card) and it goes down. So I uninstalled Debian but it is still down. Next my internal memory card deletes everything i have on there. Good thing I backed up internal memory card on computer but the question is why!?!?!? Plz help I only got 49.4mb left.

Have you deleted the debian image file? Uninstalling is not enough, the image file will remain in the internal memory card.

I did uninstall the debian apps and it was in external memory card.

Then you may be suffering the corrupt mmc problem.
Since you already have a backup of your internal mmc, I'd suggest formatting it and recovering from backup.
Read this post/thread for more detailed instructions:
http://www.internettablettalk.com/fo...corrupt+memory

Thank you! I reformatted everything and even reflashed my os. If it comes up again I will post it.