When using Hyper-V or System Center Virtual Machine Manager (SCVMM) as hypervisor for XenDesktop 7, the “Select one or more storage devices for the new virtual machines” dropdown box stays empty.
You need to verify that the account you use has the delegated administrator role or enough rights in SCVMM to see the library and you need shared storage (like a Share or iSCSI or Fiber Channel).
When you changed the storage and the rights, restart the wizard and now you can see the storage from the dropdown menu.
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