Running windows 10 on an nvme. I tried to swap out an older non boot drive and was greeted with the above message. Reconnected the drive and my system booted right up. It seems like using bootrec.exe from the recovery console is a way to fix this. Is there an easier or safer way? There are several bootrec commands and it's not clear which ones I actually need to use. /fixmbr /fixboot /rebuildbcd. Any ideas?