Hey - I just bought the Seagate Freeagent 750gb I formatted it to the Mac OS Extended Journaled but it says the total capacity is 698gb.... I know hard drives aren't the exact number(size) as advertised but is it just me or does the loss of 50gb seem excessive? If i was to just "Erase" and click the button "Erase free space" and have it write zero's - would that free up a little more of the "lost" 50gb? or do you think the drive is faulty and I should return it? thanks!