What exactly you mean - how does it demonstrate itself? Hame you not selected copy on your external foldder by any chance? I've never heard of that and I seriously doubt the PS3 would do that on it's own ...
Have you actually seen it copying it accros or do your files now appear on their own under Video and Music section without you selecting the external USB hard drive? What's the remaining free space on your internal drive?
Maybe some screenshots would help to show what's happening there ...
Mate, thanks 4 replying , i removed all the videos/movies i had on my internal, copied all the movies i wanted to my external using my pc, then i plugged the external to ps3 and everything was fine , they all came up in the g2 potable device, watched a bunch of them then turned ps3 off.
Then yesterday i noticed when i turned it on that my system internal space had gone down by 20gigs, so i went over to videos and it had copied a bunch of them to the internal to my horror. no chance i copied them to internal i would have seen the usual copy dialog come up.
Gonna delete them and see if it does it again, just thought that an UN- JB PS3 might need to make a copy to play, but since thats not the case. see if it does it again.
Realy weird ... unless it's it's some new "feature" I have no idea how that happened. Just try it again and report back. Does it happen for Music as well or just for Video?