Windows 8 and 8.1 Forums


UEFI Bootable USB Flash Drive - Create in Windows

  1. #420


    Posts : 879
    Windows 10


    Quote Originally Posted by son goku View Post
    The 1st option from your guide ("1. How to create UEFI Boot Mode compatible Windows 8 64-bit USB flash drive, which is only bootable in UEFI Boot Mode.") seems to be missing something. It says that you just need to format the flash drive in FAT32 and then copy (extract) the contents of the Windows 8.1 ISO to the USB flash drive. But, I think it's not going to be bootable because the flash drive is not marked as 'active'.
    UEFI boot mode do not use boot sectors on the USB flash drive (and the hard drive) and do not require active partition to be set.

    Quote Originally Posted by son goku View Post
    While the 3rd option ("3. How to create Legacy BIOS Boot Mode compatible Windows 7/8 32/64-bit USB flash drive, which is only bootable in Legacy BIOS Boot Mode.") Correct me if I'm wrong but, isn't it that as writen in Rufus in Partition scheme and target system type: MBR partition scheme for BIOS or UEFI computers -- shouldn't it be for both UEFI and legacy BIOS bootable, provided that you set the file system as FAT32 instead of NTFS?
    I have not tried, but...

    https://github.com/pbatard/rufus/wik...S_and_EFI_mode

    Why doesn't Rufus create a Windows installation USB that can be booted in both BIOS and EFI mode?

    If you are using a Windows ISO that can be dual booted in EFI or BIOS mode, you may find that the USB created by Rufus does not preserve the dual EFI+BIOS boot feature.

    Especially, the Windows 8 installation ISOs, that support both EFI and BIOS boot, will be converted to either one or the other mode, depending on the option you selected under Partition scheme and target type: If you select the first option (MBR partition scheme for BIOS or UEFI computers), the USB will be bootable in BIOS-mode only (even on UEFI systems), and if you select any of the other options, the USB will be bootable in EFI mode only (and not bootable on a BIOS system at all).

    This is done to avoid confusion, as it can be difficult for non expert users to know whether they actually booted in EFI or BIOS mode, when an USB Flash Drive can be booted in both modes, and installation is meant to be a one-off operation, targeting a very specific machine and boot mode. You probably don't want to go through a full Windows installation, only to realize that it was installed in BIOS mode, when you really wanted it installed in EFI mode.

    By ensuring that only one or the other can be used for Windows installation, there is no room for error with regards to which mode that was used for installation.

    Note that this does not apply for Windows To Go, and that you can also enable dual EFI+BIOS boot by using the Alt-E cheat mode (see below) with Rufus 2.0 or higher.

      My System SpecsSystem Spec

  2. #421


    Posts : 11
    Windows 7


    Quote Originally Posted by alphanumeric View Post
    I create mine with diskaprt for my wife's Acer Laptop. It is very fussy as how the thumb drive is created. That laptop never ever lists a UEFI install option for the thumb drive. It did install in UEFI mode though.
    Option 2
    select disk #clean
    create partition primary
    format fs=fat32 quick
    active
    assign
    list volume
    exit
    My ASUS laptop on the other hand is fine with NTFS formatted drives, even for UEFI installs. I use the Windows 7 DVD download tool to create its thumb drive, and install thumb drives for my two desktop PC's. They don't have UEFI BIOS. Up until we got the Acer I always used the Windows 7 DVD Download Tool.
    Thanks alphnumeric! One last thing though, If I you use the Option 2 which is as you described the Diskpart method, will the created thumb drive installer be both UEFI and BIOS bootable (provided that you set the correct boot mode in the UEFI settings)?
    With regards to your ASUS laptop being able to install in UEFI even in NTFS formatted thumbdrive, I read your discussions with Akeo and if I remember correctly, I think Akeo said that it is due to the ASUS UEFI firmware having both a FAT and NTFS driver or module and hence, it allows install of UEFI in NTFS formatted thumbdrive.

    Quote Originally Posted by genet View Post
    Quote Originally Posted by son goku View Post
    The 1st option from your guide ("1. How to create UEFI Boot Mode compatible Windows 8 64-bit USB flash drive, which is only bootable in UEFI Boot Mode.") seems to be missing something. It says that you just need to format the flash drive in FAT32 and then copy (extract) the contents of the Windows 8.1 ISO to the USB flash drive. But, I think it's not going to be bootable because the flash drive is not marked as 'active'.
    UEFI boot mode do not use boot sectors on the USB flash drive (and the hard drive) and do not require active partition to be set.
    Oh ok. I learned something new today.

    [QUOTE=genet;478606]
    Quote Originally Posted by son goku View Post
    While the 3rd option ("3. How to create Legacy BIOS Boot Mode compatible Windows 7/8 32/64-bit USB flash drive, which is only bootable in Legacy BIOS Boot Mode.") Correct me if I'm wrong but, isn't it that as writen in Rufus in Partition scheme and target system type: MBR partition scheme for BIOS or UEFI computers -- shouldn't it be for both UEFI and legacy BIOS bootable, provided that you set the file system as FAT32 instead of NTFS?
    I have not tried, but...
    https://github.com/pbatard/rufus/wik...S_and_EFI_mode

    Why doesn't Rufus create a Windows installation USB that can be booted in both BIOS and EFI mode?


    If you are using a Windows ISO that can be dual booted in EFI or BIOS mode, you may find that the USB created by Rufus does not preserve the dual EFI+BIOS boot feature.

    Especially, the Windows 8 installation ISOs, that support both EFI and BIOS boot, will be converted to either one or the other mode, depending on the option you selected under Partition scheme and target type: If you select the first option (MBR partition scheme for BIOS or UEFI computers), the USB will be bootable in BIOS-mode only (even on UEFI systems), and if you select any of the other options, the USB will be bootable in EFI mode only (and not bootable on a BIOS system at all).

    This is done to avoid confusion, as it can be difficult for non expert users to know whether they actually booted in EFI or BIOS mode, when an USB Flash Drive can be booted in both modes, and installation is meant to be a one-off operation, targeting a very specific machine and boot mode. You probably don't want to go through a full Windows installation, only to realize that it was installed in BIOS mode, when you really wanted it installed in EFI mode.

    By ensuring that only one or the other can be used for Windows installation, there is no room for error with regards to which mode that was used for installation.

    Note that this does not apply for Windows To Go, and that you can also enable dual EFI+BIOS boot by using the Alt-E cheat mode (see below) with Rufus 2.0 or higher.
    I always thought that Rufus creates USB flash drive that's both UEFI and BIOS bootable but that seems not to be the case. It's a good thing you pointed it out to me.

    Thank you very much genet. You've been of great help!
      My System SpecsSystem Spec

  3. #422


    Sydney, Nova Scotia, Canada
    Posts : 6,487
    Windows 10 Education 64 Bit


    Quote Originally Posted by son goku View Post
    Quote Originally Posted by alphanumeric View Post
    I create mine with diskaprt for my wife's Acer Laptop. It is very fussy as how the thumb drive is created. That laptop never ever lists a UEFI install option for the thumb drive. It did install in UEFI mode though.
    Option 2
    select disk #clean
    create partition primary
    format fs=fat32 quick
    active
    assign
    list volume
    exit
    My ASUS laptop on the other hand is fine with NTFS formatted drives, even for UEFI installs. I use the Windows 7 DVD download tool to create its thumb drive, and install thumb drives for my two desktop PC's. They don't have UEFI BIOS. Up until we got the Acer I always used the Windows 7 DVD Download Tool.
    Thanks alphnumeric! One last thing though, If I you use the Option 2 which is as you described the Diskpart method, will the created thumb drive installer be both UEFI and BIOS bootable (provided that you set the correct boot mode in the UEFI settings)?
    With regards to your ASUS laptop being able to install in UEFI even in NTFS formatted thumbdrive, I read your discussions with Akeo and if I remember correctly, I think Akeo said that it is due to the ASUS UEFI firmware having both a FAT and NTFS driver or module and hence, it allows install of UEFI in NTFS formatted thumbdrive.
    I've used thumb drives done via diskpart to install in legacy mode on my desktop PC's. Yes, ny ASUS has the module in it to allow UEFI installs from NTFS drives. It's too bad they all didn't do this as it makes it really easy to do UEFI installs. If they all did it we wouldn't be having this discussion.
      My System SpecsSystem Spec

  4. #423


    Posts : 11
    Windows 7


    Ok. Thanks for the confirmation that the Diskpart method works with both UEFI and Legacy BIOS mode.

    You're exactly right. If only the other major Board Manufacturers did what Asus has done then all these UEFI problems and limitations wouldn't have existed.
      My System SpecsSystem Spec

  5. #424


    Posts : 24
    8.1 pro + Ubuntu


    Hey Shawn... ( or whoever else can jump in and help )

    Been at this a while and seriously need some help.... My brain is so cloudy from trying to work this out for 8 hours searching online for an answer and trying anything I can think of, that I even posted this on the 7 forum before realising it should be here so you as OP and writer of tutorial can hopefully sort this out.

    Got a new machine (Qosmio X70-B-102) which like most tries to force me to use Windows 8 platform preinstalled... no chance thankyou... my machine and I'll run it how I choose to.

    So my plan has always been to do a clean install of 7 x 64 pro which I already own.

    Initially I learn that the BIOS needs to be changed from UEFI to CSM... no prob that's easy... but the hybrid SSHD is set up with GPT partitions and my 7 wont install unless they are MBR.

    At the advanced options screen I can delete all partitons and format but I end up with one single unallocated drive that remains as a GPT cos the advanced options don't offer the necessary conversion to MBR.

    So... I do some reading and discover that in fact Windows 7 WILL install to GPT providing the installer I use can do that and as you efficiently describe and teach, the RUFUS installer allows us to select 'GPT partition scheme for UEFI computers'

    Hmmm... brilliant I thought... I can keep using the UEFI firmware advantages by installing onto GPT partitions.

    So I got Rufus and created my bootable windows 7 x64 Pro selecting the 'GPT partition scheme.....'

    Only change I then make to the BIOS is to disable secure boot and boot order to USB.... oh AND turn off 'Fast Boot'

    Standard 'Windows loading' white progress bar on black screen.... then the recognisable logo begins to go thru it's motions of 'Starting Windows' and the 4 coloured squares fly around to form the logo.... only it never completes and it hangs !!

    Question 1.... Are there enough benefits to keeping the UEFI and sticking with GPT partition and trying to pursue with installing this way OR should I just forget that and open a command window from the language screen with Shift + F10 and open DISKPART to clean and convert the new single partition to MBR...?

    Question 2... Anyone got any idea why this installer is hanging at the point listed above...? And if so is it fixable?

    I used the latest RUFUS available 1.4.12 (although I note there's a beta version 2.0 available and wondering if it may just address this issue..?)

    All help greatly appreciated

    Nick....
    Last edited by base1268; 21 Feb 2015 at 12:19.
      My System SpecsSystem Spec

  6. #425


    Posts : 22,279
    64-bit Windows 10


    Hello Nick, and welcome to Eight Forums.

    With Windows 7, I'd say skip UEFI.

    Yep, you could use the "Clean" command at boot with step 7 in OPTION TWO below to convert the disk to MBR.

    Convert GPT Disk to MBR Disk - Windows 7 Help Forums
      My System SpecsSystem Spec

  7. #426


    Posts : 24
    8.1 pro + Ubuntu


    Quote Originally Posted by Brink View Post
    Hello Nick, and welcome to Eight Forums.

    With Windows 7, I'd say skip UEFI.
    Cheers Shawn... and thanks for the fast reply... I was about to take a break completely.

    I'm one of those people who hates being defeated.... do you know 'why' my laptop doesn't like the Rufus USB installer set-up exactly as you describe...?

    I read the quote that arkhi listed on his 7 forum tutorial :

    "In addition to better interoperability, UEFI firmware provides several technical advantages:"

    UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with - Windows 7 Help Forums

    This got me thinking that my 7x64 pro would run at it's best on my new machine if it can take advantage of using UEFI.... so any heads up you can enlighten me with as to why my installer 'stalls' would be greatly appreciated.

    In the mean time just to get up and running I will go with legacy BIOS and convert the disk to MBR so it will install.

    BTW... will my 8GB NAND flash become redundant installing this way...? Just curious... I'll be cloning the Hybrid onto a big SSD once my money tree bears fruit

    Nick
      My System SpecsSystem Spec

  8. #427


    Posts : 22,279
    64-bit Windows 10


    Nick,

    Your NAND flash should still be usable,

    If you wanted to, you could install 64-bit W7 with UEFI, but you would still need to set firmware to use UEFI instead of legacy, and wipe and convert the disk to MBR first.
      My System SpecsSystem Spec

  9. #428


    Posts : 24
    8.1 pro + Ubuntu


    Shawn...

    I'm installed and currently loading the 7x64 drivers having converted the disk to MBR using Diskpart from cmd during installation and of course I'm running in compatibility mode.

    So as the disk is now already MBR converted can I simply reinstall in UEFI mode...? where do I go to set the firmware to UEFI instead of legacy...?
      My System SpecsSystem Spec

  10. #429


    Posts : 22,279
    64-bit Windows 10


    Quote Originally Posted by base1268 View Post
    Initially I learn that the BIOS needs to be changed from UEFI to CSM... no prob that's easy...
    It's the same as you did above, but change it back to UEFI instead.

    Afterwards, yep, you would boot from the UEFI USB, start installation, delete all partitions on the disk so it's unallocated, select the unallocated disk, and let installation finish.
      My System SpecsSystem Spec

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UEFI Bootable USB Flash Drive - Create in Windows
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