On 4/5/25 20:26, Max Nikulin wrote: > ... > UEFI almost certainly can boot from mbr (DOS) partition, otherwise it > will be impossible to boot from USB pen drive. ...
AIUI the USB pen drive must be partitioned specially, each partition must be formatted specially (e.g. raw machine code, binary data structures, filesystems, etc.), and the various boot loader stages must be coded specially for a USB pen drive to boot in both BIOS computers and in UEFI computers.
The Debian installer "ISO hybrid" format adds an additional dimension in that the image can be burned either to an optical disc or to a USB disk, and both media will boot in both BIOS and UEFI computers. Very "trick", indeed.
All of the above is predicted upon architecture, revision, and configuration -- motherboard, processor, chipset, firmware, Setup settings, expansion bus, adapters/firmware, optical/disk/flash drives, etc.. It "mostly" works on "most common" computers.
David
