At least for me on a R810 with BIOS version 2.7.4. It’s a bit more work but it get’s the job done. While an update for the system firmware is in the works and won’t be to long away let me share you how I dealt with this issue. This I learned via my very helpful twitter friend Florian Klaffenbach The reason for this seems to be that the firmware is still not 100% up to date for how Windows Server 2012 deals with UEFI installations. In a good (by the book UEFI) install you’d see a layout like this (from Sample: Configure UEFI/GPT-Based Hard Drive Partitions by Using Windows Setup): It just seems to create a 320MB System Reserved partition and the rest is for your OS installation as Primary partition. The problem is that the Windows installer doesn’t seem to create the best practice UEFI partitions. The most current UEFI OS Deployment on a R810 is a bit finicky when you want to deploy Windows Server 2012 using the normal procedure & selecting “Other OS” as it’s obvious that the entry for Windows Server 2012 is not in there yet.
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