hello! I am having a problem with partitioning my external harddrive. at the moment it is devided by three partitions. I want to make it 4. so I want to delete one and than create 2 partitions with the space that comes available. however, I can't delete the partition I want. when I try to, disk utility says the partition is too small to delete. however it is over 160 gb ( from the 500) . any ideas how I can solve this?