http://o2cgnt55iwlishovskr6xovntd4o67loqmwh4g24bdg7qh3gmtydmxyd.onion/blog/2023/01/securely-wiping-data.html
You must run this command twice, in order to be reasonably sure that you've also wiped any overprovisioning space On Windows, download Eraser and run the 3-pass DoD wipe on any files currently on the USB. Once this is done, run the "Erase unused space" option on the USB. Once completed, run the "Erase unused space" option once more, to account for any overprovisioning space.