I have the 16GB PB and am suffering from low space. I decided to go into my files and check it all out. I added up all the folder sizes that exist in the playbook stuff like camera, pictures, video, downloads ect...everything. Even Misc. and I got roughly 7GB used...but only 2.5gb of free space listed under Settings>About>Hardware. I do not understand, I should have roughly 9GB of space free. I don't think the BB OS takes up 7GB. Any help will be appreciated.