Oh, right, this is what I was originally going to post before I got sidetracked:
Today, I discovered that SD cards do not like being run over by cars
I got tangled up in my headphone cord while crossing the street, and my MP3 player hit the ground with enough force to eject the SD card. I was able to retrieve the MP3 player before the next car came, but had to wait for 5 cars to run over the SD card before I could retrieve it. It looks just fine, but nothing will recognize it. I have other cards, and I can replace the content that was on the card, but it will take me hours to get it organized the way it was! I have backups of the files but not of the way in which they were organized on the card.
The only file for which I do not have a backup was an audiobook in which I had about 45 minutes remaining. The suspense is killing me!