Before Storage Spaces came along, there were other ways to tell Windows to treat multiple drives as one. There was Drive Extender, a more technical version of what we know today as Storage Spaces.
That feature is gone now, but dynamic disks, basic disks, and spanned volumes are still around—another way of slicing and dicing your actual disks in clever ways.
If this older, more complex, decidedly more advanced topic interests you, a free bonus appendix to this chapter awaits, called “Dynamic Disks.pdf.” You can download it from this book’s “Missing CD” page at www.missingmanuals.com.