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  1. #1
    ROG Enthusiast Array
    Join Date
    Oct 2012

    Question P9X79 Deluxe EUFI

    I put together a system with the ASUS P9X79 Deluxe board and was wondering why do I have the UEFI labels on the drives in the priority list. I have one SSD and optical drive installed.

    From the pic this is what is shown. The first is Windows boot manager with the UEFI label > optical drive with Windows 7 DVD and UEFI label > my SSD > optical drive again.

    This is the first time I'm using a UEFI BIOS so I'm not familiar with them. So this is what I want to know:

    1. Why does the BIOS show a Windows boot manager icon. When I first booted into the BIOS after assembling the PC I only seen the SSD and optical drive.

    2. Why do I have two optical drives listed. One is with the UEFI label, the other without. I only have one optical drive. When I remove the DVD from the drive and reboot into the BIOS the one with the UEFI label disappears.
    Miniatura de Adjuntos Miniatura de Adjuntos uefi.jpg  

  2. #2
    ROG 師傅 Array Arne Saknussemm PC Specs
    Arne Saknussemm PC Specs
    Laptop (Model)Laptop?...No way! (Model?...Jun Amaki...yes way!)
    ProcessorTHREADRIPPER 1920X
    Memory (part number)F4-3200C14Q-32GVK
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    Storage #1Samsung 950 PRO
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    CPU CoolerCustom Loop: Dual D5s, Dual Alphacool Monsta 480s, XSPC Raystorm Neo TR4, EK TitanX WaterBlock
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    Arne Saknussemm's Avatar
    Join Date
    Apr 2012

    This does happen on UEFI BIOSes...some drives show as UEFI and as sata....I don't know the reason for it but it isn't a problem as far as I know. Maybe someone else can give the technical explanation....

  3. #3
    imMortal Kombatant Array Myk SilentShadow PC Specs
    Myk SilentShadow PC Specs
    MotherboardASUS Rampage IV Formula
    ProcessorIntel i7 3930K
    Memory (part number)8GB Corsair XMS3 1600
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    Sound CardROG Xonar Phoebus
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    OS Win7 Ultimate x64
    Myk SilentShadow's Avatar
    Join Date
    Jan 2012

    I noticed the UEFI tag too when I first installed Win7 on my vanished though when I ejected the DVD and checked the BIOS again lol

    It may mean, with regards to the UEFI icons, that the OS is UEFI(maybe? idk if that is the case) and there is a UEFI DVD in the drive, for example, your Windows DVD

    Though I am only purely speculating here

  4. #4
    ROG Guru: Blue Belt Array
    Join Date
    Apr 2012

    Booting Windows or Linux from an external disk is not well-supported by Apple’s firmware. It may work for you, but if it does not work, there is nothing EFI can do about it.

    Note that at least Windows XP needs special patches to successfully boot from a USB or Firewire drive. That’s because it normally re-initializes the driver stack during the boot process in a way that disrupts its own access to the boot drive.

    undet the link from microsoft website for you reference

  5. #5
    ROG Guru: White Belt Array
    Join Date
    May 2012

    UEFI Label

    If you should have and get all the UEFI features then you should boot from UEFI Label Windows disc or USB.
    Otherwise installed windows in a different manner.
    As if you create a system image of Windows and then to use it you have to boot from UEFI Label.
    Otherwise, you can not use the system image if you boot from without UEFI Label.
    Then if you have put Windows on USB, it must be formatted Fat32 otherwise you can not see USB as UEFI Label.
    CPU: Intel Core i7 3930K
    Motherboard: Asus Rampage IV Extreme X79
    Memory: Corsair Dominator CMP16GX3M4X1866C9
    Graphics Card: 2x ASUS GeForce GTX680
    SSD Drive: 2x Corsair SSD Force Series GT 90GB Raid 0
    Power Supply: Corsair AX 1200W PSU
    Case: Cooler Master Cosmos II Ultra Tower
    Cooling: Water cooling GPU/CPU/SYD
    OS: Windows 8 64 Bit
    Monitor: Samsung 27 LED SyncMaster S27A950
    Speaker: Logitech Z-906 5.1 THX, DTS
    Sound Card: Sound Blaster X-Fi Titanium Fatal1ty Professional

  6. #6
    Tech Marketing Manager HQ Array Raja@ASUS's Avatar
    Join Date
    Apr 2011

    The UEFI prefix refers to a GPT partition. For more info on GPT partitions see here:

    When you are installing Windows, if you select the installation drive with UEFI prefix, it will perform a GPT partition of the drive you are installing to.

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