Learn the HashiCorp Enterprise Stack 
»Hyper-V
Warning! This feature is experimental and may break or change in between releases. Use at your own risk. It currently is not officially supported or functional.
This feature currently reqiures the experimental flag to be used. To explicitly enable this feature, you can set the experimental flag to:
VAGRANT_EXPERIMENTAL="disks"
Please note that VAGRANT_EXPERIMENTAL is an environment variable. For more
information about this flag visit the Experimental docs page
for more info. Without this flag enabled, any disks defined will not be configured.
Because of how Hyper-V handles disk management, a Vagrant guest must be powered
off for any changes to be applied to a guest. If you make a configuration change
with a guests disk, you will need to vagrant reload the guest for any changes
to be applied.
For more information on how to use VirtualBox to configure disks for a guest, refer to the general usage and configuration guide for more information.