Not transferring all recovered files to new HDD

Finally got all music files checked (few thousand of them). When I try to copy those to a new HDD, it only transfers a few of them. For most (68k), it gives an error message showing that the files can't be found. I'm confused. If Recuva found them in the first place, how is it that they can't be found when I try to transfer them? I'm stumped.

Please help! Thanks. :)

What exactly is the error message? Are you running a normal or deep scan? Are you trying to recover deleted or non-deleted files? What's the state of the disk?