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0x0000:0x7c00, it relocates itself, determines the "active" partition and loads its VBR (first sector) it at the same address,0x0000:0x7c00. This VBR was the first stage of the bootloader specific to the installed OS. Of course, this is how it was originally done, and the process has evolved over the last 40 years. You certainly do not need a VBR, especially if your installed bootloader, like GRUB, overwrites the MBR with its own code specific to its boot scheme