Now before you begin to give advice, I have checked google and everywhere else I could look. Now I know there is a partition for the OS which is roughly 2.5GB on the Playbook I own, so that's not the missing memory. I have 7GBb of media (movies pics music) 14MB of text and 700MB of apps. Where is my other 5.5GB?
Also awesome device for the people who don't own one yet. It has almost replaced my pc completely. Do your self a favor and buy one.