One of my nanopi neos stopped booting recently, I just took a little long getting a serial console attached. It is not booting because fsck of ROOT throws this at boot time: fsck.ext4: Unknown code ____ 251 while recovering journal of ROOT fsck.ext4: unable to set superblock flags on ROOT Some googling and I see people suggesting this is essentially the card saying "no more writes". Interestingly - mount -o ro /dev/mmcblk0p2 /mnt - works fine mount -o remount,rw /dev/mmcblk0p2 /mnt - works fine cd /mnt/tmp delete some files cd /mnt umount mount -o ro /dev/mmcblk0p2 /mnt Indeed <some files> remain in /tmp. I was able to make a tar copy that I can copy to another card, but does anyone know if this is correct, that an SD card might simply stop accepting writes, with no indications other than the above ? -- Per Jessen, Zürich (-3.6°C)