“I bought a small SSD to get a fresh start and bonus performance.”
I bought a SSD and put my OS on it but it was labeled “E”. Couldn’t get it to “C” nor could I erase my old “C”.
Removed my old “C” and booted and SSD came up as “C”!
Reinstalled my old “C” and it came up as “E”. Reformatted old drive.
That’s one reason that USB disk drive boxes and Disk Editor s/w are available. Dual/multiple OS boot s/w can be done, but a clean install on a known empty disk is more straight forward. Besides, it’s easier for the FBI to investigate.