If when you boot Windows 11/10, you see Non-System disk or disk error, Replace and strike any key when ready on a black screen, this post will help you.

If you see Invalid system disk, Replace the disk and then press any key when you try to boot into Windows, here are a few troubleshooting suggestions you want to try.

I got a Non-System Disk or Disk Error when I booted up my 2 year old Compaq notebook. After restarting about 50 times over the span of half an hour, Windows eventually started successfully.