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Switch Windows 8 between UEFI -> Legacy BIOS modes


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#1 ndog37

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Posted 17 December 2012 - 05:03 AM

Does anyone have a method or suggested way of converting/switching Windows 8 install from legacy BIOS <-> UEFI. Both to and from. The laptops I am talking about support UEFI and Legacy BIOS modes.

 

I ask this because I know it is possible to retroactively convert Windows 7 from IDE <-> AHCI mode by booting into offline PE, adjusting the registry to point at updated mass storage devices. Note these are both BIOS changes, so I realise this is something altogether different. Read here. 

 

I'm asking because I'm lazy to reinstall the OS from scratch.Legacy BIOS so I can boot into grub2, UEFI so windows 8 boots faster.

http://www.intel.co....-windows-7.html

http://blogs.msdn.co...ver-before.aspx

 

As for the disk formatting, GUID and MBR, I would assume this needs to be taken into account as well.



#2 Sha0

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Posted 17 December 2012 - 07:07 AM

I would have to guess that it's as simple as using the appropriate BootMgr. I could be wrong.

#3 Holmes.Sherlock

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Posted 10 August 2013 - 07:35 AM

I would have to guess that it's as simple as using the appropriate BootMgr. I could be wrong.

 

But what about the conversion between GPT and MBR partition tables?



#4 Sha0

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Posted 26 October 2013 - 04:33 AM



But what about the conversion between GPT and MBR partition tables?

Syslinux includes GPT-booting MBR code, if that's what you mean.






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