This ones always coming up, Its because the makers of drives use 1000 to rebresent a thousand megabytes when in fact it takes 1024 megabytes to make a gigabyte. plus when you format a drive and get it ready for an OS you always lose a small amount in overhead. I allways use Partion Magic to partition and check my drives, sometimes you have a small amount of hard drive space that partition magic lets you recoup.