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Thread: z77 extreme4 UEFI boot help needed




  1. #1
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    Default z77 extreme4 UEFI boot help needed

    I am trying to install Windows 8 off of a USB drive to a RAID partition > 2.2TB
    The USB drive, 16GB, is formatted to FAT32.
    The Windows 8 image on the USB drive has bootmgr.efi in the root.
    I have the USB drive in a USB 2.0 port. (I have also tried using a 3.0 port)
    When I select UEFI: xxxx I get nothing.
    Update: I am running bios v 2.7
    Thoughts?
    Last edited by sry; 12-09-2012 at 11:48 PM.

  2. #2
    parsec's Avatar
    parsec is offline Senior Member
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    Default Re: z77 extreme4 UEFI boot help needed

    Is your RAID partition formatted in GPT?

  3. #3
    profJim's Avatar
    profJim is online now Chief Munchkin + moderator
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    Default Re: z77 extreme4 UEFI boot help needed

    Maybe these links will help with your usb installation:
    http://winsupersite.com/article/wind...usb-memory-key
    Official Windows 7 USB/DVD download tool

    In the past, others have used the HP usb tool to make bootable flash drives.
    I don't know if things need to be done differently with win8.
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  4. #4
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    Default Re: z77 extreme4 UEFI boot help needed

    Thanks for the replies.
    Yes the partition is GBT.
    I can boot off of the USB normally, but windows install still won't work with the large partition.
    Perhaps I'm mistaken, but I assume when I select UEFI:xxx, the system will attempt to boot off of device xxx in UEFI mode. When I do this the system does nothing. My gut says there is either something missing from the USB drive that the system needs in order to boot in UEFI mode.
    I've seen write ups for windows 7 and the *.efi files needed on the USB drive. I've seen nothing for windows 8. That being said, I do see similar efi files on the win 8 image.

    Is there a bios setting to enable UEFI boot? I have reset the bios to default and re-setup the RAID.

  5. #5
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    Default Re: z77 extreme4 UEFI boot help needed

    Solved!
    I used a 32 bit version of Windows 7 to create my install media from the download. I re-downloaded on a 64 bit W7 system and then built the install media. All of the UEFI files were present.

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