To change default hard drive from C: to D: in Windows 11/10, change the default save location for apps and files, move user ...

It is easy to do for other drives using the disk manager, but the main drive is another story. But, I figured out a method on how to do it in case anyone wants to.

If you find that the C or D Drive letter is missing from Explorer in Disk Management in Windows 11/10, maybe after an Update, try these solutions to resolve the issue.