I think I understand what you are saying, but i'm not sure if you are correct.
My hard drive is 500GB. It is partitioned to Macintosh HD which is 420gb and Bootcamp which is 80gb. On the first image taken from Disk Utility, it shows the capacity of that partition to be 419.25 GB, but when you add the available and used space, you get a total of 380.96 GB. My question is where is my 38.29 GB?
Never the less, thanks for replying.
[edit] Also, forgot to add that if System Information and Disk Utility divide differently, then why does one show 28.31GB vs 28.27GB free space which are really close, compared to the difference of the total size of the partition 380.96 GB to 419.25 GB?