See Using USB drive mode to transfer files to your device . 3.Open Device Info 4.Tap Reset Options. 5.Do one of the following: A.Tap Erase Apps & Data twice to delete all personal information, such as events, contacts, and tasks, as well as applications you have added. (This option does not affect the USB drive.) B.Tap Erase USB Drive twice to erase everything stored on the USB drive (photos, vide