Content Comparison

root@xilinx-zcu102-20192020_2:~# hexdump -C /dev/sda -n 4096 | more

root@xilinx-zcu102-20192020_2:~# dd if=/dev/urandom of=/dev/sda bs=1k count=3

root@xilinx-zcu102-20192020_2:~# hexdump -C /dev/sda -n 4096 | more

root@xilinx-zcu102-20192020_2:~# hexdump -C /dev/sda -n 4096 | more
# Again, it should be blank, this is the expected output:
00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00001000

root@xilinx-zcu102-20192020_2:~# dd if=/dev/urandom of=/dev/sda bs=1k count=1024

root@xilinx-zcu102-20192020_2:~# hexdump -C /dev/sda -n 4096 | more

root@xilinx-zcu102-20192020_2:~# hexdump -C /dev/sdb -n 4096 | more

root@xilinx-zcu102-20192020_2:~# fdisk /dev/sda
Device contains neither a valid DOS partition table, nor Sun, SGI, OSF or GPT disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that the previous content
won't be recoverable.

root@xilinx-zcu102-20192020_2:~# ls /dev/sda1
/dev/sda1

root@xilinx-zcu102-20192020_2:~# mkfs.vfat /dev/sda1

root@xilinx-zcu102-20192020_2:~# mount /dev/sda1 /mnt

root@xilinx-zcu102-20192020_2:~# sync