Thats because you'll need to reforamt the Stock HDD in order (to unlock or repartition the Drive), to give up the last Two Gb's of storage that would make up your F:\ Drive. Some really great advice at this time is not to worry about it most XBOX™ Games are at least twice this size! So it's not like you missing anything. Eventualy when reasion sets in and you decide to go for a Modchip then you can simply replace this Stock HDD with a bigger one which will most certanly have a F:\ Drive and if your really lucky it might just have a G:\ Drive on it too...