Patching dvd rom need DOS MODE

how to i get XP to boot to strictly DOS mode to flash my nec dvd rom drive. According to the instructions i have to go into dos mode not sure how with xp or is there another way please. Can I create a boot disk for dos in xp with a cd…please help

You have to create a bootable disc, either a floppydisk or cd/dvd.

Normally you can use BINFLASH without the need for DOS.