
Select the unallocated space, click New , then Format .
When you see “Where do you want to install Windows?” – don’t click Next yet.
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Boot from the disc (press F12, ESC, or Del during startup to change boot order).
Use free software like Rufus (on a Windows PC) or balenaEtcher (on Mac). Point Rufus to the DBAN ISO and write it to your USB drive. Select the unallocated space, click New , then Format
and press Enter.
Plug the USB into the old PC. Restart and press the boot menu key (usually F12 for Dell/HP, F10 for Lenovo, or ESC for others). Select the USB drive. If you have an old PC or laptop
Select each partition and click Delete until you have only “Unallocated Space.”