@kottes we need a little more information in order to assist. We need to understand whether your issue is a hardware issue or a software issue, so please respond to these questions: When you insert the sd card that does not function, do the logs indicate the card was inserted? (use logread command to view logs) If YES to question 1, please post the portion of the log Post the content of /etc/config/fstab Post the output of the command: mount