I got a really cool SimpleTech 120GB HDD and it won't work. I plug it in and the computer recognizes it....although I don't get a HDD icon on the desktop, I get a weird USB icon...but when I try to drop files on it, it says that the drive cannot be modified. The drive is brand new. What do I do to make it work? Oh, also, under "owenership & permissions" it says I can only read.