Brand new shiny PCI-E SSD installed in my test Hyper-V R2 box.
Low-level format with 4k sector size.
Windows sees it fine, mounts it fine. Copy a few template VHD's to it. Duplicate them, friggin screaming fast.
Create new VM based on existing template VHD - all is fine up until I click "finish.
Google says Hyper-V doesn't support VHD's on cluster/sector sizes larger than 512bytes.
SERIOUSLY?