I am trying to securely erase my external hard drive before I sell it. However, after buying two different copies of DBAN, I keep getting the "can't open proc cmdline" message. I am not too crazy with the idea of messing with my computer BIOS. I am not at this time planning to sell my computer, so I would appreciate a secure erase software that can securely wipe both internal and external hard drive discs, which are separate from the location of my operating system, from within Windows 10.
I would also appreciate suggestions for alternative secure erase software packages that are designed to work on Windows 10 which can be bootable from either a disc or USB stick when I get ready to replace my computer.