It seems to me that you should construct the unique ID corresponding to your requirements. This ID can be constructed as a hash (like MD5, SHA1 or SHA512) from the information which is important for you (some information about software and hardware component). You can make your solution more secure if you sign such hash … Read more
I recently wrote some General Bootloader Tips in a Stackoverflow answer that may be of some use to you. Likely Tip #1 applies to your problem: When the BIOS jumps to your code you can’t rely on CS,DS,ES,SS,SP registers having valid or expected values. They should be set up appropriately when your bootloader starts. You … Read more
If you are on Linux you can do it with DD utility. There is a version of DD for Microsoft Windows as well. General DD usage If you wish to make a zero filled virtual disk image the size of a 720K floppy you can use dd like this: dd if=/dev/zero of=disk.img bs=1024 count=720 This … Read more
All of the forementioned functions are unique in what they accomplish, but at first the abundance does seem somewhat exagerated. Int 21h AH=02h Write Character To Standard Output This function interprets the character codes 7 (Beep), 8 (Backspace), 9 (Tab), 10 (Linefeed), and 13 (Carriage return). All other character codes are displayed. Backspace is nondestructive … Read more