https://static.spiceworks.com/attac...Disk_on_UFD.pdf
Walkthrough: Create a Bootable Windows PE RAM Disk on UFD
This walkthrough describes how you can create a bootable Windows PE RAM disk on a USB flash drive (UFD)
device by using the Copype.cmd script. Windows PE RAM enables you to start a computer for the purposes of
deployment or recovery. Windows PE RAM boots directly into memory, enabling you to remove the
Windows PE media after boot.

Note
This method boots directly into memory and is assigned the drive letter X, which does not correspond
to the media (UFD, CD-ROM) from which you booted. Ensure that you have sufficient memory to
support the size of your Windows PE image plus any additional memory requirements, for example, if
you plan on running any customized applications that need additional working memory.