Below is the compatible USB drive list after test. It can work with 128M-4G USB Flash drive. 

Compatible USB drive for 
  Brand           Capacity   
  mp3               128M   
  SanDisk       4G   
  Teclast       1G   
  netac          512M   
  netac          4G   
  SSK              512M   
  SSK              1G   
  kingston   2G   
  kingston   4G
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