You might call me crazy, but I bought my xoom from a pawn shop. When I picked it up it already had a sd card in it and it was ready to use. I had to unroot it to update and after that I wanted to get rid of all the junk that the previous owner had on it so I just deleted it all. I now realize that this was a mistake, but my xoom will not format it and after I format it to Fat32 and put it into my tablet it will not save files to the card or format it, the only way I can do anything with it is with a pc. I would really appreciate some help here, I'm not sure if I deleted any essential files for it to run.