I don't happen to have any spare USB sticks so I thought that I could flash an image onto one of my three internal system disks. I tried to remove all disk partitions on the disk (yes i backed up all data), but i could not remove one, as it had security enabled. So I looked up how to clan a disk and found the diskpart clean method. I used the command, initialized the disk as a GPT disk, and flashed an image to it. I have also tried Initlizing the disk as MBR, and leaving it uninitialized as well. When I booted into the BIOS, however, the disk did not show up as bootable. I know this method has worked in the past (I used it to try and install arch Linux), but this time it did not. I am trying to install Linux mint. I used blenca etcher to flash the image (no errors or warnings except the one warning me about flashing to a system disk). I got the mint ISO from the official website.