I have a problem with my external USB HDD. When listening to some of my music in iTunes, iTunes will lock up and start skipping as if it can't read a cd. This is repeatable with certain songs. The same songs also won't copy to my iPod. I have narrowed it down to either the files being corrupt, or the case being no good. The case is the cheapest one that I could buy, so it wouldn't seem too far out of the ordinary. Except that I don't have any troubles with any of the other files on the disk. Which leads me to believe that some of my music files (maybe 5%, strewn about randomly through them all) are corrupt. But I don't understand how this would come to be. I can't copy the affected files using the finder or cp, either. Disk Utility says that there are no problems with the disk/file system itself. Any experts that can offer some advice? Any way to salvage what remains of my music?