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Virtualize Win8.1: BIOS + MBR Physical Partition > to > WIM Image > to > UEFI GPT VHD Virtualizing Win8.1 from BIOS + MBR Physical Partition > to > .WIM Image > to > UEFI GPT .VHD Sometime last year I found out about Native boot VHDs and tried to go that way for good. There were some issues with hardware and OS (Win7 at the time) not working out and lot of new things that I was learning about VHDs. Anyways, that confusion, learning and failure led to a better path So this 2015, I figured out how to get VHDs (with Fresh Win 8.1 Installs via Install.WIM DISM Apply Image) to Native Boot on Surface Pro 3 (Sp3). I am going to attempt doing the following steps using DISM/ ImageX: MBR [Customized Win 8.1] (Physical) > Create Image > [Customized Win 8.1 .WIM] (Virtual - File based so - No sectors or MBR/GPT?? ). [Customized Win 8.1 .WIM] (Virtual) > Apply Image > [Empty New GPT .VHD] (on SP3) My thought is that by going to .WIM I bypass the whole converstion drama between MBR/BIOS & GPT/UEFI as the .WIM is agnostic of both of them? Is this a valid thought or not? Thoughts? NOTE: I can.. try out the above with creating a small FRESH MBR Windows 8.1 partition on X61T/ T61 and then doing the above 2 steps. Convert it to a .WIM and then applying to a GPT .VHD I am guessing a SYSPREP is recommended somewhere in between. Someone somewhere also mentioned doing Sysprep in a VM/ Hyper V instead? Thoughts? Where and how would you recommend applying the SYSPREP?