LINK 2 2 2 COMANDO PER SCRIVERE IMMAGINE:
dd bs=4M if=2019-09-26-raspbian-buster-full.img of=/dev/sdf conv=fsync
DD VERBOSE:
apt-get install pv dialog
FULL COMMAND:
(pv -n /dev/sda | dd bs=4M if=2019-09-26-raspbian-buster-full.img of=/dev/sdf conv=fsync) 2>&1 | dialog --gauge "Writing image, please wait..." 10 70 0