I just received a used Ipad (must be the original ipad bought in 2011) and am trying to add new books to iBooks. I have been able to add a few books that I have on itunes to my ipad. I now would like to add new epub books (not bought through itunes). I have them loaded on itunes and selected them (I still have the other books on itunes, but I deselected them when I synced my Ipad. Now all the books on my ipad disappeared and only the new books that were selected (with a check mark next to them) on itunes are loaded on my Ipad. Some of the books that disappeared had bookmarks on them. What should I do to add just new books without erasing what's already on my ipad? this is my first Apple product and it is driving me crazy. I thought I can just drag and drop books from Win explorer, but no luck. I have downloaded many apps (Dropbox, Syncios, ) and they are not helping.