How to remove windows 7 from another drive?

Question

Windows

I bought an SSD and installed windows 10 on it, on the old HDD I left win7 for the installation and configuration so that there was a working system, and some files are convenient to transfer rather than download again, etc. that the Windows 10 bootloader picked up the old system and now when loading the selection menu. So how to remove win7 so that it disappears from the bootloader menu, preferably without deleting all files from the HDD?

Answer 1

bcdedit /? /delete

Answer 2

run ->msconfig -> boot ->delete the one that is not marked as a live system.
This is the removal from the bootloader, with the removal of files a little more complicated. They are marked as systemic and may resist removal