Thank you for your reply
1
Is any way before move on, backup efi partition to usb stick
? Is it any good to backup? Can i use xcopy: https://www.ubackup.com/backup-restore/xcopy-command-to-copy-folders-and-subfolders-6688.html ?
2 sfc
I think ran "sfc" to the data disk, by error, and interrupt it
So from that time I think... later disconnected data drive...
3
Booting up from 21H1 DVD, Is OK if PC is 20H2 update of October 2021...?