Originally Posted by robko
And unlike most USB drives etc, make sure to TAKE THE TIME TO PROPERLY EJECT THE KOBO before pulling out the USB cord from the computer. The database seems to be somewhat sensitive to being corrupted sometimes if you don't eject it before disconnecting.
You should do this for ALL USB drives. People think you don't need to because Windows used to write direct to USB drives (no write cache) so they usually got away with pulling them without ejecting properly.