MacBook Air :: 64GB SSD Shows Up As 59.68GB In Snow Leopard?

I have a Rev A MBA with the 64GB SSD, and am just wondering why it shows the capacity as ~60GB under Snow Leopard, when I'd thought it was supposed to show the capacity as it is marketed as, i.e. as 64GB? I read somewhere that there is also some capacity taken up by partitioning, but doesn't 4GB taken up by partitioning seem like a lot? I just thought I should ask since I don't really understand... I found another thread but then it seemed like the person only lost 1GB due to partitioning, and that was on a 1TB drive, meaning they were loosing far less of the drive's capacity as a % than I seem to be. Finder shows the capacity of my SSD as 59.68GB, System Profiler as 60.02 GB (60,022,480,896 bytes), and Disk Utility as 60.02GB. Just to make it clear I understand all the base 10 vs. base 2 stuff, it's just that under base 10 in 10.6 I don't understand why my SSD doesn't show up as 64GB.