This should've been very simple. I have a Roamio Plus, working fine. Per instructions that I found on the web that looked reliable, I got a WD Red 3T hard disk. The installation couldn't' be simpler. Unscrew the old one, unplug the single cable. Screw in the new one. Plug the cable back in. Make sure it is seated well (check again twice later). Power on.

Welcome To Tivo
Starting Up...

Great. But 6 hours later its still there. Open up, reseat everything. Try it again. 3 days later, same message.

One very subjective thing: While I hear the fan I can't hear the sound of the disk. (p.s. its not an ssd