I have an Iomega hard drive of 148,93 GB and it works with firewire. When I click on the hard drive icon and press + I , so I get the info about it it says that there's 1,31 GB space free, so 147,61 GB have been used. Now I really need more space, so I'm deleting lots of files. Now I have counted the one map in the hard drive where all the rest of the files are in, at it is only 55 GB. How come that it still says on the hard drive that I've only 1,31 GB free?