so i have a 2.5" usb ext hdd that stores all of my music and movies. it has been giving me a lot of problems lately. i was trying to move some of my music over to another external i have. whenever it reaches a certain point in the hard drive, i think it's about after 20.52 gigs, it stops transferring and just stays there at the finder file copy window. whenever i try to cancel the transfer with the x in the window.. it does nothing and the window will sit there until i reboot. i tried to outsmart my hard drive and move my stuff little chunks at a time, but i still get stuck at a few different parts where i assume there are corrupt sectors in my HDD.. i used disk utility to repair the disk, but it says there is nothing wrong. any suggestions on how i can fix my disk, or at least move all my stuff off of it so i can reformat it?