Samsung PN51F4500AFXZA E-Manual page 96

® If you use a USB extension cable, the TV may not recognize the USB
device or may not be able to read the files on the device,
® If a USB device connected to the TV is not recognized, the list of files on
the device is corrupted, or a file in the list is not played, connect the USB
device to a PC, re-format the device, and then copy the files onto the
device again,
® If a file you deleted from your PC is still found on the USB device, re-
attach the USB device to your PC, delete the file, and then use the "Empty
the Recycle Bin" function on the PC to permanently delete the file,
® If the number of files and folders saved on a USB storage device is over
approximately 4000, the files and folders may not appear and some
folders may not be opened,
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