Originally Posted by
Procrastinus
Agree with FD above, except I would not put the old drive back as a secondary drive ( why have it spinning away all the time?)
Just put it away in a box and connect it back in if needed in the future
I do it exactly the same for myself and the old one becomes a physical backup.
For others, they get a video how to launch BIOS and change the boot sequence. If re-activated OneDrive sync will update the new documents created with the SSD already running in reverse to the original HDD. Also good when in immediate need to connect an ancient peripheral that is only supported under W7. It's a trick to mitigate the "I told you W10 was a wrong idea". Don't like it? Press F12 at power-up and then one arrow down before hitting the enter key. Back in the old shoes under 3 minutes.