I recently bought a 4TB hard disk because my laptop internal hard drive is full and its performance became slow. So I thought to move all my files to the hard disk and reset my laptop. When I try to copy the files some folders are copied and when I try to copy the large file some of the content is copied and it reduced to 0 bytes/sec and waited for long so that it will start but nothing happend.The external hard drive uses the USB 2.0