USB Flash Drive Multiboot
setup from Windows

Download and install the following utilities:

1) HP USB Disk Storage Format Tool (SP27608.exe)
2) Grub4dos installer
3) Grub4dos

Format the drive using the HP utility:

Use grub4dos installer to install the boot loader:

Copy grub files, DOS files, and WinPE files to the usb drive:

07/02/08  12:04 AM               163 autoexec.bat
02/22/09  12:59 PM    <DIR>          boot
12/12/08  11:03 PM           377,151 bootmgr
04/23/99  10:22 PM            93,890 COMMAND.COM
02/01/09  01:19 PM                52 config.sys
02/22/09  12:59 PM    <DIR>          DOS
01/26/09  02:28 PM           210,479 grldr
04/23/99  10:22 PM           222,390 IO.SYS
02/01/09  06:19 PM               120 menu.lst
01/26/09  09:41 AM                46 MSDOS.SYS
02/22/09  12:59 PM    <DIR>          util

Edit menu.lst to show grub how to load each OS:

title DOS98
find --set-root /io.sys
chainloader /io.sys
title WinPE30
chainloader /bootmgr

 

For fast DOS boot, use this msdos.sys:

[Options]
SystemReg=0
Logo=0
DisableLog=1

... and this config.sys:

device=\dos\himem.sys /testmem:off
buffers=99,8

To setup WinPE 2.0 or 3.0 for multiboot, you must run bcdedit.exe. Good luck with that.