"Multiboot HDD 2021 Final" generally refers to a customized, bootable hard drive (or high-capacity USB) image released in 2021 that contains a comprehensive suite of operating systems diagnostic tools recovery utilities

Essential Tool List for the 2021 Final Arsenal

Step-by-Step: Building Your Multiboot HDD 2021 Final

UEFI & Legacy BIOS support

– Boots on modern (UEFI) and older (BIOS) systems. Secure Boot may need disabling, but that’s common.