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How to create UEFI bootable USB to install Windows 8.1
How to create UEFI bootable USB to install Windows 8.1
11-29-2013 - 04:58 AM
 blackguy
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You have a UEFI-based PC and you used Windows 7 USB/DVD download tool to create a bootable Windows 8.1 installation USB drive. You go to BIOS to change the BIOS boot order of drives and don’t know why you cannot find the USB drive marked as UEFI bootable in the Boot Device Menu.
In this tutorial we will show you how to create a bootable USB flash drive for Installing Windows 7, Windows 8, or Windows 8.1 on a UEFI-based computer.
Note:
  • To boot a UEFI-based computer from a USB flash drive, the drive needs to be formatted using the FAT32 file system.
  • FAT32 has the limitation of the maximum individual file size of 4 GB and the maximum volume size of 32GB.
  • 32-bit editions of Windows are not supported by Microsoft for booting on a UEFI-based computer.
  • UEFI works with a new partitioning scheme: GUID Partition Table (GPT)
Requirements:
  • A USB flash drive with a minimum of 4 GB
  • Windows 7 (64-bit) ISO or
  • Windows 8 (64-bit) ISO or
  • Windows 8.1 (64-bit) ISO
  • You can also use a Windows installation DVD instead of an ISO file

Please insert your USB flash drive into an available USB port before perform these below steps.

METHOD 1: Using third-party freeware - ISO2Disc
Step 1: Download and install ISO2Disc
Step 2: Launch ISO2Disc. Click on the Browse button and select your 64-bit Windows 8.1 ISO file.
You can also select Windows 7 (64-bit) ISO file or Windows 8 (64-bit) ISO file as your demand.
   

Step 3: Select the Burn to USB Flash Drive option.
Step 4: Select your USB drive from the list.
Step 5: In the Partition Style list: select GPT.
Step 6: Click on the Start Burn button.
 
And wait several minutes for the burning procedure to be complete then you will have a UEFI bootable USB to install Windows 8.1.


METHOD 2: Using third-party freeware - Rufus
Step 1: Download at the official site: http://rufus.akeo.ie/
Step 2: Run Rufus and click Yes if prompted by the User Account Control.
   
Step 3: Select the settings as:
  • Device: select your USB flash drive
  • Partition scheme and target system type: select GPT partition scheme for UEFI computer
  • File system: select FAT32
  • Cluster size: select Default
  • Format Options:
    • Quick format: checked
    • Create a bootable disk using: select ISO Image then click on     icon and select your ISO file.
    • Create extended label and icon files: checked
  • New volume label: enter your desired label for the USB flash drive or leave the default name.
Step 4: Click on the Start button then click on OK to confirm the warning.
The program will now start copying the ISO file to make your bootable UEFI USB flash drive.
   
 
And after more than 15 minutes, you will have a UEFI bootable USB to install Windows 8.1, Windows 8 or Windows 7.
   

METHOD 3: Using Microsoft’s Diskpart - a command-line hard disk partitioning utility.
Step 1: Open a Command Prompt with Administrator privileges in Windows 7 or Windows 8 or Windows 8.1.
Step 2: Type in these below commands then press Enter:
            diskpart
            list disk     
            select disk X                 (caution: replace X with your target USB drive, in my case it is disk 2)
            clean
            create partition primary
            format fs=fat32 quick
            active
            assign
            list volume
            exit
   

Step 3: Copy all files and folders in the ISO or DVD onto the newly created UEFI boot USB flash drive.
(if you are creating a UEFI bootable USB flash drive for installing Windows 7, please continue with step 4. If not, go to step 5)

There’re many ways to copy files in an ISO to USB flash drive:
#1 - If you’re using Windows 8/ Windows 8.1:
  • Navigate to the folder that contains your ISO file.
  • Right-click on the ISO file > select Mount
   
  • It will automatically bring you to the mounted ISO file.
  • Click on Select all or press Ctrl + A to select all files and folders.
  • Right-click on them > select Send to > select the Removable Disk with the volume letter that you created in step 2 above.
   
#2 - If you’re using Winrar:
        (Download the full version of Winrar here, the trial version here)
  • Navigate to the folder that contains your ISO file.
  • Right-click on the ISO file > select Winrar > select Extract files
   
  • Select the Removable Disk with the volume letter that you created in Step 2 above > click on OK
   
#3 - If you’re using 7-Zip:
        (Download 7-Zip here)
  • Navigate to the folder that contains your ISO file.
  • Right-click on the ISO file > select 7-Zip > select Extract files
   
  • Click on the Browse button > Select the Removable Disk with the volume letter that you created in step 2 above > click on OK > click on OK
   

Step 4: if you are creating a UEFI bootable USB flash drive for installing Windows 7, please follow these steps below. If not, go to step 5.
Navigate to your Removable Disk > efi > microsoft and copy the boot folder
   

Up to the efi folder and paste it.
   

Download and install the free archive manager 7-Zip.
Navigate to your Removable Disk > sources
Right-click on the install.wim file > select 7-zip > select Open archive and wait some seconds for 7-zip to open it.
   

On the 7-Zip navigation window, go to folder install.wim\1\Windows\Boot\EFI\
   

Right click on the bootmgfw.efi file > select Copy to > click the Browse button and select your desktop > click OK > close 7-zip.
   

Navigate to your desktop > rename the bootmgfw.efi file to bootx64.efi.
Copy the bootx64.efi file into the Removable Disk > efi > boot folder
   
(This post was last modified: 11-29-2013 08:31 PM by blackguy.)
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RE: How to create UEFI bootable USB to install Windows 8.1
06-22-2014 - 07:54 AM
 tomsailor
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Very useful for sidestepping an ASUS Z97-motherboard UEFI BIOS 1008 bug that prevents installing Windows 8.1 on GPT-initialized drives: use rufus-1.4.9.exe to create UEFI FAT32 Flash drive, extract Windows 8.1 iso to it, and delete the bootmgr file. Then UEFI bootloader necessarily runs the remaining bootmgr.efi, which is happy to continue Windows Setup and installation with an uninitialized or GPT-initialized target drive. (The bug: UEFI BIOS 1008 -at least- sees and runs the bootmgr file even if you're installing from a UEFI(FAT32)OpticalDrive selected with F8: bootmgr refuses to install Windows on a GPT-initialized drive, and it MBR-initializes an uninitialized drive. Case NA3780774 filed with ASUS online eSupport)
FYIs: Ignore OEM-warning about partitions not in recommended order if you install to a GPT-initialized drive: result is same as for uninitialized drive. Acronis Disk Director 12.0.3223 "successfully" creates a Win 8.1-UNREADABLE UEFI FAT32 Flash drive: use rufus for now.
 

 
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