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