At the end of each flight I download the day's flight log onto a SD card that I insert. However, sometimes it doesn't make it to the card but ends up...
Your USB stick has become stuck mounted read-only which is preventing the EFIS from writing the daily system backup to the stick. Pull the stick out...
The Seattle Avionics CharData Manager will load the FAA airport diagrams, and if selected, will load the SA airport diagrams on the memory stick too....