There's been sufficient evidence that they are involved in hacking/rewriting HDD firmware. See: https://www.wired.com/2015/02/nsa-firmware-hacking/ https://www.

There's been sufficient evidence that they are involved in hacking/rewriting HDD firmware. See: https://www.wired.com/2015/02/nsa-firmware-hacking/ https://www.wired.com/2015/02/nsa-firmware-hacking/