F3 check for faulty and fake SD card
[Post Reformating Required] sudo umount /dev/sdX; # Unmount it if it's currently mounted sudo mkfs.ext4 /dev/sdX; # Format it to ext4 # If it's not mounted automatically: sudo mkdir /media/new_folder_name sudo mount /dev/sdX /media/new_folder_name f3write /media/new_folder_name f3read /media/new_folder_name/ Reference: https://starbeamrainbowlabs.com/blog/article.php?article=posts%2F402-fight-flash-fraud.html List all the attached devices sudo fdisk -l Run f3probe for examination f3probe --destructive --time-ops /dev/sdb If you encounter this kind of error f3probe: libdevs.c:324: read_all: Assertion `(*__errno_location ()) == 5' failed. Resolution: install the package libude version 1 sudo apt-get install libudev1 libudev-dev