Hi Lissie: I lost some books, however they were all backed up. When I work on a book, I save it both on my BN and my flash card. however, I used it as a back up for my computer and lost most of my notes for the semester. I'm slowly getting them replaced though. I prefer to blame this on Mercury Retrograde, which an astrologer friend told me is terrible on technology. Since both my computer and this crashed during the Mercury Retrograde, I'm tempted to agree! Amber