If you create a standard VM images in your hypervisor (HyperV 2012, Vmware...) that VM can be used as a template for any other VM creation using this switch and causes Sysprep to skip the physical device recognition phase:
Path:
c:\windows\system32\sysprep
sysprep.exe /oobe /generalize /shutdown /mode:vm
The only additional options that apply to VM mode are /reboot, /shutdown, and /quit.
Here is relative Technet article:
https://technet.microsoft.com/en-us/library/hh824938.aspx
