I have two external drives that contain my iTunes library. On one drive the library contains about 3 gb more content than the other as I switched drives and just started using one over the other. One drive is a MyBook 400gb, the other is a Lacie 160gb. The MyBook has the "outdated" library on it. It also only has about 50 gb space left on it. The Lacie has about 14 gb space left so I decided to just copy my iTunes folder from the Lacie to the MyBook. As it turns out I was given an error that there's not enough space on the MyBook to do this despite the fact that I am copying a folder with the same title on both drives. I would have anticipated the message would be asking me to replace not to replace. No such luck. I then deleted the iTunes library from the MyBook, however, even after unmounting and mounting the drive it still says there is only 50gb left. I searched the drive and I can't find any music/movies on there so I'm not sure why it is still reading as though it is full. I thought it was just a fluke so I tried to copy the folder again and it still said the drive was too full. I also emptied the trash, unmounted both drives, shut them both off, then back on and let them mount. Still, no change in the status of the sizes.