Now i know the big number on the front of the box isnt completely acurrate and drives are usally a few GB smaller than the advertised size, However i just purchased a 160GB drive and to my horror once windows had installed it was showing as 127GB, thats 33GB missing!! is this likely to be a problem with windows reporting the drive size or is it more likely that the drive is missing 33GB?

If it is just windows will i be able to use the missing 33GB or is there some trickery i can perform to get a more accurate reading, also are there any tool sout there that may be more accurate. I have tried searching both the forums here and google for hese answers but with no luck any help much apriciated cause if there really is that much space missing this drive is going back.