Can't transfer data from one external hard drive to another?

I have just purchased my first Mac book Pro a few weeks ago and i seem to be having alot of trouble transfering data between my to hard drives.
One is a 500gb and the other is a 1tb both with movies and photos on them, i want to tranfer the last data from the 500gb to the 1tb and format the 500gb.
I have tried to drag and drop and copy and paste but nothing seems to work? The movies are in avi format too so not sure if that makes a differance or not but that is another issue i would like to sort. How to change the complete hard drive to mp4 or do i do them one by one?
Any help would be great as i dont want to regret this purchase so early in the piece.
Thanks to all in advance.

Yes.

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