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I have a Toshiba Satellite that came with windows 8 pre-installed on it. After foolishly wiping the HDD, I acquired a Windows 8 install disk.

My problem is that the computer will skip attempting to install from the disk, but ONLY while the firmware is set to UFI. While set to CSM mode, the install CD boots and will proceed with the install until it refuses to install to any partition because of something GPT related.

The disk works fine on other machines, and when booting under UFI mode my computer simply attempts to boot from the next device in boot order (the HDD).

What I want to know is, - why is my computer skipping my install cd? Why only when I boot in UFI? - How can I force my computer to boot from the install cd in UFI? - If the above is impossible, how can I force Windows 8 to install through the GPT error?

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  • try my answer first please, you will solve your problem.
    – George Dima
    Oct 5, 2014 at 2:03
  • Are you attempting to install a 32bit or 64bit version of Windows 8? The 32bit disc will not boot in UEFI mode on 64bit CPUs, because WinPE requires matching architectures. technet.microsoft.com/en-us/library/hh824898.aspx
    – Robin Hood
    Oct 5, 2014 at 5:59
  • Hey Robin Hood, I am using matching architectures. My install CD is 64-bit and the computer is as well.
    – Forrest Keppler
    Oct 5, 2014 at 22:14

2 Answers 2

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I had the same "problem". The settings your laptop came with won't work because secure boot is enabled. Try to keep your "BIOS" in UEFI mode and just disable secure boot.

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  • This makes no sense windows 8 supports secure boot there isn't any reason it shouldn't work
    – Ramhound
    Oct 4, 2014 at 12:30
  • Not sure if it's the case for every laptop, but mine only boots from the hard drive with secure boot enabled.
    – Sacha K
    Oct 4, 2014 at 12:34
  • secure boot has nothing to do with the boot devices detected. it is uses during Windows loading to ensure it hasn't been compromised. Maybe when you disabled it , also UEFI got disabled , and CSM went to Legacy boot (old BIOS mode).
    – George Dima
    Oct 4, 2014 at 12:59
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    No, disabling secure boot and going back to legacy mode are two different settings in my UEFI. Anything that doesn't have a valid crypto signature won't show in the boot device selection screen with secure boot enabled.
    – Sacha K
    Oct 4, 2014 at 13:19
  • secure boot is disabled. Enabling secure boot creates an error if I boot from either the hard drive or my win8 install cd
    – Forrest Keppler
    Oct 4, 2014 at 20:58
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You are doing it wrong.

First of all, if I remember well, only 8.1 x64 supports UEFI.

second, you need to make a USB installation disk for UEFI: get the free tool Rufus, open it, select the ISO image file of your Windows version that you have downloaded, and for settings select GPT and FAT32, the others leave default.

After booting, the UEFI will see the new UEFI boot device (USB) and allow you to boot from it and install.

also, make sure you get the latest 8.1 Update 1 ISO MSDN (April-2014), this way you'll have fewer updates to do after install.

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    Niether 8.1, nore a usb are required for UEFI. technet.microsoft.com/en-us/library/hh824898.aspx
    – Robin Hood
    Oct 4, 2014 at 21:10
  • you don't understand the problem, read more and talk after, it's about UEFI bootable Windows install disk, not about native UEFI support from Windows.
    – George Dima
    Oct 5, 2014 at 2:03
  • I do understand the question, and while the link does focus on installations, it does also cover media as well.
    – Robin Hood
    Oct 5, 2014 at 5:53
  • and what is your sollution other than creating an UEFI (GPT) USB install disk ?
    – George Dima
    Oct 5, 2014 at 10:22
  • I don't yet have a solution; I'm currently awaiting a response to the detail I requested from him about which disc he's using, 32bit or 64bit.
    – Robin Hood
    Oct 5, 2014 at 19:47

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