No, it's not. It's not audible to me at normal TV volume levels, but it is by no means dead silent. This has been claimed and refuted many times before.
post #5881 of 7721
2/16/13 at 7:52am
I have installed three (or so) and they have been (much) quieter than the TiVos they replaced. Typically, I have to get within a foot or so before I can hear them...