Once you install the drive and have the TiVo up and running, try doing a warm reboot (restarting the system from the menus) and a cold reboot (pull the plug, count to 10, plug it back in.) On the TiVoHD and Premiere lines, the non-AV drives would have difficulty restarting from one of these states (cold boot, I believe, but too lazy to search to verify.) This was due to the parking feature in the drive. If you recover from both boots normally, you should be fine, if not you'll have to pull the drive and look for instructions to run wdidle3 on the drive. It's not terribly complicated, but will take a bit of digging, downloading, etc. to be able to do it. Once it's done, you should be all set. I installed a WD Red drive in my Roamio Basic and did not have to run wdidle3 - hopefully it's no longer an issue with TiVo's, but I don't think anybody has done testing to confirm yet. Hope everything goes smoothly for you guys. Edited to add: if you've done upgrades on previous versions of TiVo, running wdidle3 will be no trouble at all, once you have the software in hand, and a computer to use it on. I'm also fairly certain I was able to run the utility with a drive attached to a USB - SATA dock, so even if you're on a laptop, I believe you will be able to do it.