The platform was made hugely popular by the Drive Extender (DE) feature that allowed many heterogeneous hard drives to be merged as a single logical unit that was extensible, but also easy to manage for the users. Unfortunately, Microsoft has decided to remove that feature based on the (crazy) idea that drives were big enough these days and that Drive Extender was no longer needed.
Instead, Microsoft is providing a utility that makes moving data easier. While I clearly don’t want to do that (please bring the Drive Extender back), someone else might be interested, so I’ve included the video that explains how this works.