I think and read that this is an urban legend (eg. Instead of /dev/zero you can use /dev/urandom to use (pseudo-)random data instead of zeros, but that will slow down the writing process dramatically! You will find often, that overwriting only one time is not sufficient to prevent recovering. That will write zeros on the entire disk, making it very unlikely that someone can recover the original data. To wipe the disk, you can use the command ![]() Make sure, that you are using the correct location, otherwise you will destroy the data set!!! In the following I assume, that the hdd is located at /dev/sda. This enables you to match the expected vs. A root shell can easily be opened byīefore you use the dd command, it is absolutely necessary to determine the correct location of your hdd. Root privileges are required to write on hardware level to a disk, therefore you need to become root. After booting into the system, you need to open a terminal. ![]() ![]() To wipe a hdd, you need to boot a Live-Image of a Linux system, eg. If you want to wipe the disk before reinstalling, you can write zeros across the complete disk using the LiveCD/LiveUSB, a terminal, and the dd command. During installation, you can reformat the whole disk. Just boot using a LiveCD/LiveUSB and (re-)install Ubuntu.
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