not to step on ebackhus's toes,
but not only can it be formatted in any machine, i find it's easier alot of times, to simply power down my main machine and pop in the drive of another machine i am working on, just so i can format it from within windows.
also, at the same time you can load certain data onto it, like drivers, and tools, to make it easier once you have something installed on it.
i find it formats faster from within windows, and i like the gui partition manager better than the dos one.