I wanted to have a USB key that could boot both UCBD and UBCD4Win, the two award winning ultimate boot CDs for rescue and other things. Turns out however that making a bootable USB key is not that simple, XP is not even meant to boot from USB apparently.
To make things simple, UBCD boots with syslinux and UBCD4WIN boots with grub. However, copying the files from UBCD4WIN on a UBCD bootable USB stick does not allow to boot XP from grub anymore (it complains about a missing boot.ini it didn't need before).
After some research and work, here's what I was able to find and come up with. I'd love to be able to just share my image with you, but because of the XP license and requirement that you use your own XP media to generate it, I can't do that unfortunately.
color black/cyan yellow/cyan default /default default 0 timeout 10title Launch "The Ultimate Boot CD for Windows" fallback 1 find --set-root /ntldr chainloader /ntldr savedefault --wait=2
title pause
# doesn't work without patched grub #title UBCD menu #chainloader /boot/isolinux/isolinux.bin #savedefault --wait=2
title BIOS configfile /ubcd/menus/grub4dos/bios.lst
title CPU configfile /ubcd/menus/grub4dos/cpu.lst
title HDD configfile /ubcd/menus/grub4dos/hdd.lst
title Memory configfile /ubcd/menus/grub4dos/memory.lst
title Others configfile /ubcd/menus/grub4dos/others.lst
title Peripherals configfile /ubcd/menus/grub4dos/periph.lst
title System configfile /ubcd/menus/grub4dos/system.lst
title Parted Magic V4.10\n Linux distro for manipulating partitions (eg. create, resize). Includes\n TestDisk, PhotoRec, Partition Image...) configfile /pmagic/boot/grub4dos/grub4dos.lst
title UBCD FreeDOS R1.38 (Based on NwDsk V3.40)\n FreeDOS boot disk used to run many of the other DOS apps on the UBCD. map --mem /ubcd/images/fdubcd.img.gz (fd0) map --hook chainloader (fd0)+1 rootnoverify (fd0)
title User-defined configfile /ubcd/custom/custom.lst
title pause
title Reboot\n Reboot the PC. reboot
title pause
title commandline savedefault --wait=2 commandline
title floppy (fd0) chainloader (fd0)+1 rootnoverify (fd0) savedefault --wait=2
title reboot savedefault --wait=2 reboot
title Darik's Boot And Nuke v2.0 ~ Submenu configfile /dban-Grub4dos.ini
title FreeDos map --mem (hd0,0)//Images/freedos.img (fd0) map --hook chainloader (fd0)+1 rootnoverify (fd0)
title GOBACK Removal Tool map --mem (hd0,0)//Images/goback.ima (fd0) map --hook chainloader (fd0)+1 rootnoverify (fd0)
title Memtest86 v3.5 (iso boot) map (hd0,0)//Images/memtest.iso (hd32) map --hook chainloader (hd32) boot
title NTFS-Dos map --mem (hd0,0)//Images/ntfs4dos.img (fd0) map --hook chainloader (fd0)+1 rootnoverify (fd0)
title Launch "Windows(tm) Recovery Console" fallback 1 find --set-root /cmdcons/setupldr.bin chainloader /cmdcons/setupldr.bin ##################################################################### # write string "cmdcons" to memory 0000:7C03 in 2 steps: ##################################################################### # step 1. Write 4 chars "cmdc" at 0000:7C03 write 0x7C03 0x63646D63 # step 2. Write 3 chars "ons" and an ending null at 0000:7C07 write 0x7C07 0x00736E6F savedefault --wait=2
Other random links I found: