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Uefi/Legacy mode Windows installation

Discussion in 'Windows 10' started by fahmi1, Feb 19, 2017.

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  1. fahmi1

    fahmi1 Thread Starter

    Joined:
    Feb 19, 2017
    Messages:
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    Hi,
    I recently bought a hp pavilion 15 au038ca model. It came with a lot of bloatware so I decided to clean install Windows10. I used Windows Key Finder software to find my key since it's embedded in the bios, wrote it down and went ahead to install the same version as my previous windows: Windows 10 home x64.
    Before I even started with the installation, I could not see my device in the boot options( I was using a bootable usb drive). So I went to the bios and enabled legacy support and when I switched my laptop back on into boot device options, there it was: a usb drive option. So i selected it and went on ahead to do a clean install of windows. Now the problem is, whenever I load up system defaults in bios and save it, my laptop does not boot into windows. It gives me this error:

    Boot device not found.

    Please install an operating system on your hard disk.

    Hard Disk - (3F0)

    ...But as soon as I enable Legacy mode, it boots up into windows. My question is, how do I install windows into uefi mode and not legacy mode? Because I read many articles saying that uefi equals faster boot times and has more advantages than the older legacy mode. And whenever i try making a bootable uefi disk, there is still no device options when only the uefi mode is on. But when the legacy mode is on, then I can see my disk under the boot device options.
    Second question, how do I change my hard disk partition to gpt from mbr?
    Thank you
     
  2. bassfisher6522

    bassfisher6522

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  3. crjdriver

    crjdriver Moderator

    Joined:
    Jan 2, 2001
    Messages:
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    You do not need to turn off secure boot and you probably should not turn off secure boot. Here is what happens. When the system is in legacy mode [how you installed windows] It boots from whatever drive you installed windows. In eufi mode, it boots from the windows boot loader which is installed on a FAT32, hidden partition of the drive.
    The only reason I can see to turn OFF uefi is to dual boot with win and linux OR to install a 32bit version of linux. Most [if not all] 64bit distros work fine with uefi.

    Here is what I would do;
    1 Start over. Set your bios the way it is supposed to be set ie secure boot ON.
    2 Check your manual for any quick boot or fast boot option. If you have this, turn it off for now. Save settings and restart with your win10 install usb inserted.
    3 During POST or when you see a splashscreen, hit the F9 key. This should bring up a boot menu; select to boot from the usb. Be sure to delete all partitions on the disk so you get rid of the previous install. The disk should be blank; let win setup create partitions however it wants.
    4 Install windows, updates, drivers, etc, etc, etc. Once you are all finished, you can again enter the bios and enable fast boot [If you want] FWIW, I leave it disabled on my asus laptop.
     
    Last edited: Feb 20, 2017
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