You can also use Storage Spaces on Windows to create logical volumes out of multiple disk, or alternatively RAID0 would work as well.
RAID0 only works with two disks, that must be the same size, if I recall correctly. You could run them in JBOD mode (just-a-bunch-of-disks), but I'm not sure if Windows itself supports that - it is a feature you can enable for some external drives like WD's if you have their drivers installed though.