Advertisements Have a nearly full 4TB backup drive for one of my Roamios (you can have multiple drives for Roamios if on same OS but that is not the point of this thread). Anyway I want to use the 4TB for a different project. And I have a couple Seagate 2.5" 4TB SMR drives I bought as possible Bolt upgrade drives back in the day before most people knew the difference between CMR and SMR and that SMR is not good for Tivos. So I decided to clone the nearly full 3.5 CMR 4TB to one of the Seagate 2.5 SMR 4 TB. I tried a cloning dock first, one I use for cloning all the time. It seems to start, but after 6 or so hours the 25% light was still flashing, that is what shows when it starts. Tried it one more time, same result. So decided to try an MFST copy. That did work. My gosh it was slow, took almost 33 hours. Speed showed like 30 MB/s direct motherboard type Sata connections. Normally when doing an MFST copy I get 80 MB/s I believe. So must be slower because copying to an SMR drive? I put the 2.5 copy into the Roamio. It booted up fine. Could see all the recordings. However navigating menus very slow, lot of blue spinning circles. Got error when trying to play some recordings. When I tried connecting to Tivo it got to "loading" but failed. So rebooted. VERY slow, though it finally made it. Same problems though. So ran a kickstart 58 on it. Seemed to have worked. Can watch the recordings that had an error before. And connected successfully to Tivo. Guess I will set aside the 2.5 SMR drive as my backup. I would never actually use an SMR drive in a Tivo if I have a choice (which you always do, with Bolts and Edge can just use external 3.5 CMR). Not 100% sure the copy is fully functional but will take a chance. If/when I want to use it I would clone back to a CMR 3.5, just nice to find a use for one of the SMR 2.5s that was sitting around gathering dust. And free up a 4TB CMR 3.5. An interesting project regardless, I enjoy playing around with Tivos.