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I know that UEFI provides for much faster boot up speeds, but as of right now it is disabled in my BIOS. Should I enable it and it'll switch over auto-magically?

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Check your assumption –  Joel Coehoorn Dec 18 '12 at 2:47

2 Answers 2

Firstly: note that while UEFI can provide faster boot times, it doesn't automatically do so; it depends on the firmware in question.

Secondly: yes, you need to reinstall Windows if you want to switch to UEFI. Windows is installed in UEFI mode only if you boot the install DVD in UEFI mode. You may also need to reformat the disk, because in UEFI mode Windows requires GPT partitions.

(Or, at least, that's how it worked with Windows 7. I wouldn't expect this to have changed in Windows 8 but I can't be certain.)

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It's easy to convert MBR disks to GPT (although I'm not sure if Windows can do it non-destructively, or if a Linux CD will be needed). –  grawity Dec 18 '12 at 8:05

This article describes how to convert a BIOS-mode Windows installation to boot in EFI mode without re-installing. I'm afraid the procedure is a bit too long for a full summary here, but basically it involves backing up your data, converting the partition table from MBR to GPT non-destructively using GPT fdisk, adjusting your firmware settings, creating an EFI System Partition (ESP), and installing the Windows boot loader on the ESP.

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Do you know if I can somehow create/copy the EFI bootloader files manually, as in part 3.5.2 of the guide you linked: copy the contents of the EFI subfolder of the Boot folder...". My Boot folder does not have EFI –  varesa Jan 24 '13 at 23:18

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