AW: Make sure your USB data carrier has been formatted in FAT32 – prior to use. Zenec recommends the use of high quality USB sticks only. Study the corresponding key features of the ZENEC device, for supported USB flash memory data carriers. Note that the USB connector of the device is current limited to 400 mA maximum consumption. In most cases, external hard disk models will easily exceed 400mA and thus, Zenec does not endorse the use of such products. Additional info for troubleshooting of USB flash memory devices and MP3 playback: