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DIY UEFI Bootable ISO for Windows Server: A Quick How-To

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DIY UEFI Bootable ISO for Windows Server: Your Easy Guide

Hey folks! Ever wanted to create a bootable ISO for your Windows Server, specifically for UEFI platforms? This guide will walk you through the process, making it as simple as pie. We’ll cover everything from prerequisites to burning the final ISO image. Let’s get started!

DIY UEFI Bootable ISO
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What You’ll Need Before We Begin

Before diving in, make sure you have these things ready:

  • Windows Server and the Right Kit: You’ll need either the Windows OEM Preinstallation Kit (OPK) or the Windows Automated Installation Kit (WAIK) installed alongside your Windows Server.
  • 64-bit System: Your target platform must be an x64-based (amd64) version of Windows Server. No 32-bit systems here!

Key Point: The resulting Windows PE CD-ROM will be bootable from both BIOS and UEFI firmware, thanks to its dual boot catalog entries. Pretty neat, huh?

Step-by-Step ISO Creation Process

Here’s the step-by-step process to create your bootable ISO:

  1. Admin Privileges: Log onto your Windows Server computer using an administrator account. You need those admin superpowers!

  2. Open the Command Prompt: Navigate to the Programs menu, find Windows OEM Preinstallation Kit (OPK) (or WAIK), and click Windows PE Tools Command Prompt.

  3. Create the Directory Structure: Type copype.cmd amd64 winpe_x64 and hit ENTER. This command sets up the necessary directory structure and copies all the essential files.

  4. Copy the winpe.wim File: Type copy winpe.wim .\\ISO\\sources\\boot.wim and press ENTER. This copies the winpe.wim file, which you just created in the winpe_x64 directory, to the ISO\sources folder and renames it to boot.wim. It’s like moving a key piece of the puzzle into place.

  5. The Magic Command: Now for the main event! Type the following command and hit ENTER:

oscdimg -m -o -u2 -udfver102 -  \
bootdata:2#p0,e,bc:\\winpe_x64\\etfsboot.com#pEF,e,bc:\\winpe_x64\\efisys.bin c:\\winpe_x64\\ISO  \
c:\\winpe_x64\\winpeuefi.iso

Don’t worry about this lengthy command; we’ll break it down shortly.

  1. Burn the ISO: Finally, burn the winpeuefi.iso image you just created onto a CD or DVD. You can use any burning software you like. Your bootable ISO is ready to go!

Burning ISO Image
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Decoding the oscdimg Command

Let’s break down that monster oscdimg command:

  • -m: This tells the command to ignore the maximum size limit of the image, just in case you have a lot of stuff to include.
  • -o: Optimizes storage by encoding duplicate files only once, keeping your ISO nice and lean.
  • -u2: Creates an ISO image with only the Universal Disk Format (UDF) file system. This is important for compatibility with UEFI.
  • -udfver102: Specifies the UDF version as 1.02.
  • bootdata: This is the heart of the command! It specifies a multiboot image with a BIOS boot sector as the default and a secondary EFI boot image for UEFI systems.
  • c:\\winpe_x64\\ISO: This is the path to the files that will be included in your ISO image.
  • c:\\winpe_x64\\winpeuefi.iso: This is the output file, your shiny new bootable ISO.

Inside the bootdata Argument

Let’s dive even deeper into the bootdata argument:

  • 2: Indicates two boot catalog entries – one for BIOS and one for UEFI.
  • #: Separates the root entries in the boot catalog.
  • p0: Sets the platform ID to 0 for the BIOS boot entry.
  • e: Enables floppy disk emulation in the El Torito catalog.
  • bc:\\winpe_x64\\etfsboot.com: Places etfsboot.com in the boot sectors.
  • pEF: Sets the platform ID to “EF” for the UEFI boot entry.
  • bc:\\winpe_x64\\efisys.bin: Places efisys.bin (the EFI boot code) in the boot sector. This is what allows the system to boot from UEFI firmware.

Congratulations! You’re Done!

You’ve successfully created a UEFI-bootable ISO image for your Windows Server! Pat yourself on the back. This is a great skill to have in your toolkit.

Now, what are you waiting for? Go ahead and boot up your system with your newly created ISO! If you have any questions or run into any issues, don’t hesitate to leave a comment below. We’re here to help. And if you want to learn more about creating bootable media or other Windows Server tricks, be sure to visit again. We’re always adding new content. Happy booting!

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