How to Wipe a Linux Hard Drive
You can use a standard Linux delete file command to selectively remove data, delete a directory in Linux, or completely wipe a hard drive.
4 Linux tools to erase your data
A common method for erasing drives is with the Linux dd command. Nearly every Linux installation comes with the dd utility installed.
Securely wipe disk
Wiping a disk is done by writing new data over every single bit. Tip: References to disks in this article also apply to loopback devices. Data remanence · Hardware-specific issues · Overwrite the target · dd
Seeking Advice
ShredOS is a USB bootable (BIOS or UEFI) small linux distribution with the sole purpose of securely erasing the entire contents of your disks ...