Secuerly wipe a disk using gnu/dd command

Gif 01: Wipe a disk using gnu/dd command

Gif 01: Wipe a disk using gnu/dd command

You can securely wipe disk
by writing new data over every single bit. This can be done with GNU/dd or Unix dd command. The syntax is:
dd if=/dev/zero of=/dev/DISK/TO/WIPE/HERE iflag=nocache oflag=direct bs=4096
OR
dd if=/dev/urandom of=/dev/DISK/TO/WIPE/HERE bs=4096
OR
dd if=/dev/urandom of=/dev/sda bs=4096 status=progress
Sample outputs:

4383293440 bytes (4.4 GB) copied, 509.124371 s, 8.6 MB/s
472446402+0 records in
472446402+0 records out
472446402 bytes (4.4 GB) copied, 1247.7 s, 3.3 MB/s

Examples and usage: How do I permanently erase hard disk?