Takeaway: You can’t boot Windows XP from a floppy disk the way you
used to be able to with DOS. One handy way to easily boot XP is by using a USB
flash drive. Here’s how to make it work.
Almost everyone who has worked with
computers for any length of time at all has run into at least one situation in
which a problem left a PC unbootable. What if you could return the machine to a
bootable state just by inserting a USB flash drive though? Believe it or not,
it is actually possible to install a bootable copy of Windows XP onto a flash
drive and then boot a PC off of the flash drive. From there, you can use
applications that you have installed on the flash drive (anti virus, anti
spyware, disk repair, etc.) to fix the PC’s problem. In this article, I will
show you how.
What’s the catch?
As with most cool new techniques,
there are a few catches. For starters, not every PC is capable of booting from
a USB flash drive. For the most part, computers manufactured within the last
two years are generally able to boot from a flash drive. Older systems may
require a BIOS update, or might not be able to boot from a flash drive at all.
Another catch is that not every
flash drive will get the job done. The primary factors that limit your use of a
particular flash drive are capacity and speed. Technically, speed isn’t really
a limiting factor, but booting Windows will be painfully slow unless you use a
flash drive that supports USB 2.0.
The flash drive’s capacity is
actually a limiting factor though. Surprisingly though, there are size limits
on both the upper and lower end. Your flash drive can’t be too large or too
small. There isn’t really a documented minimal size for a flash drive. You just
need something large enough to hold Windows XP and a few applications. As you
probably know, Windows XP normally consumes over a gigabyte of disk space.
Later I will show you how to use a free utility to trim the excess fat off of
Windows XP and make it a whole lot smaller. Even so, I still recommend that
your flash drive be at least a minimum of 256 MB in size.
As I mentioned, there is a maximum
size for the USB flash drive that you can use. Currently, USB flash drives
exist in sizes of up to 4 GB, and 8 GB flash drives are expected to be
available by the end of the year. As nice as it would be to have 8 GB to play
with, the flash drive that you use for this project can be no larger than 2 GB.
The reason for this is because you will have to format the flash drive using
the FAT-16 file system, which has a 2 GB limit. Presently, you are stuck using FAT-16
because most computers will not recognize a flash drive as being bootable if
the drive is formatted with anything other than FAT-16.
Preparing your Windows installation CD
One of the requirements for creating
our bootable USB flash drive is a Windows XP with Service Pack 2 installation
CD. If your Windows XP installation CD doesn’t already include Service Pack 2,
then you will have to make a CD that includes Service Pack 2 through a
technique called slipstreaming.
In addition to your Windows XP
installation CD, there are a couple of other things that you are going to need.
For starters, you will need the HP USB Disk Storage Format Tool. You can
download this tool for free.
Another utility that you are going
to need is Bart’s Preinstalled Environment Bootable Live Windows CD / DVD, or
BartPE for short. You can download this utility for free from the BartPE Web site.
In addition to the software
requirements, you must verify that the PC that you will be using to create the
Windows deployment has 1.5 GB of free hard disk space (minimum) and supports
booting from a USB device. I also strongly recommend that the PC be running
Windows XP Service Pack 2. Prior to Service Pack 2, Windows XP sometimes had
trouble interacting with USB storage devices.
Formatting the flash drive
Now that you have all of the
prerequisites taken care of, it’s time to actually start setting up our flash
drive. The first step in doing so, as strange as it sounds, is to format the
flash drive. Windows will actually let you format a flash drive in the same way
that you format a floppy disk. However, formatting a flash drive in this way
will not work for this project. Furthermore, using Windows to format a flash
drive directly has been known to destroy some types of flash drives.
Instead, you must format the flash
drive by using the HP USB Disk Storage Format Tool that you downloaded earlier.
To do so, simply open the utility, select the device followed by the FAT file
system option and click Start.
Once the device has been formatted,
you must make it bootable. To do so, you must copy the BOOT.INI, NTLDR, and
NTDETECT from the root directory of your PC’s boot drive to the flash drive.
These files are hidden by default, so you will either have to configure Windows
Explorer to show hidden files (including protected operating system files) or
you will have to open a Command Prompt window and use the COPY command to copy
If you choose to use the Windows
Explorer method, then open Internet Explorer and enter C: into the address bar
so that you are looking at your local hard drive. Next, select the Folder
Options command from the Tools menu. When the Folder Options properties sheet
opens, select the View tab. Now, just select the Show Hidden Files and Folders
and deselect the Hide Extensions for Known File Types and the Hide Protected
Operating System Files check boxes. Click OK to continue.
Booting from the USB flash drive
Now that you have formatted your USB
flash drive and installed the boot files onto it, the next thing that you must
do is to configure your PC to allow you to boot from the flash drive. This is
all done through the computer’s BIOS Setup. I can’t give you specific
instructions for this part, because every computer is different. I can give you
a few pointers though.
You can access your computer’s BIOS
by pressing a specific key immediately after you turn the PC on. The key
varies, but it is usually either [F1], [F2], or [Delete]. Once you are in the
BIOS Setup, you should verify that all of your computer’s USB options are enabled.
This might include things like support for legacy USB devices or support for
USB 2.0. If there is a time out setting for USB devices, you should set it to
the max to insure that the system doesn’t time out while waiting on the USB
device to boot.
Next, find the section on boot
device priority. Normally, a USB flash drive (which is usually listed as
USB-HDD, but may be listed as a removable device) will have a very low boot
priority. If the USB flash drive’s boot priority is lower than the hard disk (listed
as HDD) then the only time the computer would ever boot off of the USB flash
drive is if the system were to fail to boot from the hard disk. You must
therefore rearrange the boot device priority so that the flash drive has a
higher priority than the hard drive.
Now that we have finally made it
through all of the prep work, it’s time to start setting up Windows. As you
have probably already guessed, the process of installing Windows to a flash
drive is quite a bit different from your normal, run of the mill installation.
There are a couple of reasons for this.
For starters, a full blown Windows
XP deployment takes up over a Gigabyte of hard disk space. When you are
installing to a flash drive, disk space is a scarce commodity. Even if you have
over a Gigabyte of space on your flash drive, you probably don’t want to use it
all on Windows. It would be nice to have room to install a few applications.
Therefore, you need to trim the excess fat off of Windows.
The other reason why the installation
process is so different from the usual Windows installation is because Windows
Setup is not designed to install Windows to a flash drive. You therefore have
to configure Windows using an alternate method.
The PEBuilder utility that you
downloaded earlier can take care of both of these issues. PEBuilder is designed
to create a build of Windows XP (or Windows Server 2003) that does not take up
as much space as a full blown installation. Once you create this new build, you
can copy it to the flash drive. For right now, I will show you how to create a
basic Windows build and copy it to the memory stick. Unfortunately, it’s rather
difficult to install applications once Windows is up and running. Therefore,
after I show you how to create a basic Windows build, I will show you how to
create a build that includes some applications.
Begin the process by opening
PEBuilder. When you open PEBuilder, you will see a screen similar to the one
that’s shown in Figure A. Simply enter the path to the Windows installation
files (the ones from your Windows XP with Service Pack 2 installation CD).
Next, verify that the Create ISO Image and the Burn to CD check boxes are not
selected and then click the Build button. PEBuilder will now create the new
Now, it’s time to copy Windows to
the flash drive. To do so, you will have to use a special batch file that’s
included with PEBuilder. Open a Command Prompt window and navigate to
c:\pebuilder313\plugin\peinst. Now, insert an empty flash drive into the
computer’s USB port and then execute the file PEINST.CMD. You will now see a
menu appear as shown in Figure B.
Type 1 and press [Enter] and you
will be prompted to enter the path to the build that you have created. Enter
C:\pebuilder313\BartPE. Now, type 2, press [Enter], and you will be prompted
for the target path. Enter the drive letter that Windows has assigned to your
USB flash drive. After doing so, the menu is updated as shown in Figure C. The
menu now displays the source path and the destination drive. Type 5 and press
[Enter] to install Windows to the flash drive.Installing applications
Now that I have shown you how to
create and install a basic Windows build, I want to talk for a moment about how
you can add an application to the build (prior to creating it). The PEBuilder
program comes pre-configured to support a number of common Windows
applications, but does not come with the applications themselves.
The reason why installing
applications can be a little bit tricky is because most Windows applications
modify the Windows registry. The build that you are creating is basically a
collection of installation files, and the build itself does not contain a
registry (the registry gets created when Windows is installed onto the flash
drive). As such, PEBuilder uses a sort of registry emulator.
If you go to the
C:\PEBUILDER313\PLUGIN folder, you will see sub folders for a number of
different applications. If you open one of these application folders, you will
see that the folder contains an INF file and a FILES folder. The INF file
contains all of the information that would normally go into the registry, and
the FILES folder stores all of the program’s files.
To see how this works, let’s install
an application that I’m sure most of you are familiar with; Nero. Begin by installing
Nero onto the machine that’s running PEBuilder, as if you planned to run Nero
locally on that machine. When the installation completes, copy all of the files
from C:\Program Files\ahead\Nero to C:\pebuilder313\plugin\nero burning
rom\files. In this particular case, the nero burning rom folder is the folder
that has been set aside for the Nero application. The Files sub folder is
intended to store Nero’s system files.
Now, you must take care of Nero’s
registry entries. To do so, go to the C:\pebuilder313\plugin\nero burning rom
folder and open the PENERO.INF file using Notepad. As I explained earlier, the
INF file in an application’s folder is used to store the application’s registry
entries. For Nero and all of the other applications that PEBuilder predefines,
the INF file is pre-configured. You just have to make a few changes that are
specific to your system.
In this particular case, the
PENERO.INF file is designed to support both Nero versions 5.x and 6.x.
Initially, the lines for both versions are commented out. You must therefore
determine which version you have and then remove the semi colon from the
beginning of the lines that apply to that version. If you look at Figure D, you
can see how the two versions are separated.
Once you uncomment the appropriate
lines, just replace "Your Name", "Your Company Name" and
"Your Serial Number" with your name, your company’s name, and your
Nero product key. Save the file, and your set to go. The next time that you
click the Build button, Nero will be included in the build.
Putting XP in your pocket
Running Windows from a flash drive
isn’t an exact science. Sometimes the process just doesn’t work and there is no
good reason why. As more PCs start to support booting from USB devices though,
USB boots should become more standardized, and the technique should become more