Hi, I have been describing on another thread how my HDX 7" is pretty much bricked. Amazon have offered to do a refurbed one at a discount price but I will have to return mine. Question is how can I be sure that all of the info, docs, pictures of my kids etc have been rendered inaccessible too? can I do anything that will give me this peace of mind? I had some work documents, account spreadsheets etc on there!