i've bought a external harddisk 500GB (2.5 inch), when i want to copy the movie (blueray) from my laptop to external hd, it prompted up a msg said that "no enough space", asked me to do disk clean up. Beside i've noticed that while copying or moving file that more than 4GB, the problem mentioned above will occur. I don't why and pls tell me whether is harddisk problem or there's other issues.