Hi, this is my first post, because I really cannot work out what is going on! I have a recently bought 500GB external hard drive (NTFS) which I want to partition to have a 100GB partition formatted to either FAT32 or Mac Extended Journaled. I have 228gb free on the drive, but when I go to Shrink Volume in Disk Management, it says I only have 342mb available?! I've tried de fragmenting the drive, but that doesn't seem to help... There isn't any software left that came with the HDD, so it can't be that... Any help greatly appreciated!