Samsung UN55ES8000G E-Manual page 553

TV is not recognized, the files on the
device are corrupted, or a file in the
list is not played, connect the USB
device to a PC, format the device,
re-copy the files to the device, and
then try playing again.
ΠIf a file you deleted from the PC is
still found when you run Smart Hub,
use the "Empty the Recycle Bin"
function on the PC to permanently
delete the file.