The device does not recognize USB memory device or USB hard disk .

(1) The power consumption of your USB storage device may be high (a USB device with a power rating in excess of that allowed for USB devices will cause the center display of the device to display a caution). Use USB devices with a rating of 500 mA or less for this device.

(2) The format of the drive is not correct. Format drives using the FAT16, FAT32 and HFS+ formats.

(3) It does not support the GUID partition map of the MAC OS standard format.

(4) A USB formatted using Mac extended format that distinguishes between upper and lower case characters.