Western digital media player- copying between USBs

[varsh_N]

had a small issue writing from one usb to the other- gave me the error= write fail- check source destination- the usb with the original files is new but had alot of the space taken up- does this affect the performance? it also has alot of xml files and t files- which i am going to delete and try again- any idea why this has happened? thanks - it started doing some of the copies- made folders but didn't take all files across. tried doing smaller batches but didnt make a difference.... any advice will help. using wd media player 2009 model- firmware hasnt been updated- not connected to the net- running 64gb verbatim usb as a carrier drive to the permanently connected seagate 3tb drive .