Significance of SP3 partitions, sizes? & which ones to recreate in Native Boot VHD Win 8.1? - I'd like to dig a bit a bit deeper to find out significance of those RE, Sys EFI Ptns? - Which can be eliminated and how.. given that MS provides a Download-able Recovery Image (5+ GB)? - Also, how should I structure my Win 8.1 VHDs for Native boot on SP3? Just sharing a little more info from Disk Management on Surface Pro 3: Physical GPT SSD - Factory Preinstalled W8.1: [350 MB : Recovery Ptn][200 MB : EFI System Ptn][232 GB : C:\Windows ][5.37 GB : Recovery Ptn] A Vanilla Hyper V Installed W8.1 on GPT VHDX: [300 MB : Recovery Ptn][100 MB : EFI System Ptn][28 GB : C:\Windows ] In my recent experiments & experiences with VHDs, I have been able to get create, deploy.. ..and Native Boot both types: Single Partition and Multi partition VHDs. ..but the Single partition VHD did not boot inside Hyper V (I guess it needs some kind of EFI push in some fashion - whether internal to VHD or externally??) Ideally, I wanted to create a Universal VHD that would also boot in all 3 environments listed below: (and move exclusively to VHDs) Preferable: - Native Boot (with Host OS) - VM Boot (in Hyper V or VMWare) Optionally: - Native Boot without a Host OS e.g. Like the examples here http://blogs.msdn.com/b/mikeormond/...-from-vhd-without-installing-a-native-os.aspx What should the VHD partition structure be for universal Native boot? - Single Partition: [\WindowsOS] - 2 Partition: [EFI Sys][\WindowsOS] - 3 Partition: [WinRE][EFI Sys][\WindowsOS] - 4 Partitions or more: .... (similar to SP3 or the above VHDX - Vanilla Install with Recovery) Note, several links violated the forum guidelines and have been removed.