Make a bootable USB flash drive to wipe an old hard drive ...
https://www.itservicescolorado.net/tech-tips/make-bootable-usb-flash-drive-wipe-old-hard-drive/
Run Universal USB Installer, select “DBAN” from the drop down list, and follow the onscreen instructions. Once the USB conversion is complete, restart the computer, and from the boot menu (see computer manufacturer’s instructions for how to select a boot device), boot from the USB device. At the DBAN menu, type “autonuke” and let it run!
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