I've tried more than a dozen USB flash drives, high-speed USB flash drives and SD / SDHC cards via USB adapter.
All between 512MB and 4GB.
Unfortunately always the same result: movies always freeze again, jump, sound often chops seconds.
For me, unfortunately lacking, the USB port was my real reason to buy.
Unit returns.
Wonder if the USB port was built only as an ornament, can not believe that so bring a device to market ...