If you have already programmed 24 tracks, 
The first track of the first directory plays automatically.
) button to stop playing.
) button again,you can remove the USB device safely.
Do not connect a USB charging device to the USB connection port on the player, because it may cause damage to the product.
Some external USB storage device may not be compatible with this player.
With external HDD, FAT format can be played.
With USB 2.0 HDD, connect to a separate power source.
If memory of an external USB storage device is segmented into several parts, MP3 files of only the first hard disk drive can be played.
DRM applied files are not played.
Even if the file name ends with .mp3, the file does not play if actual file format is MPEG layer 1 or 2.
Do not use a USB hub as it will not be recognized.
Up to 15 letters of MP3/WMA file name will be shown.
Removable HDDs equipped with less than 160 Gbytes are supported. Removable HDDs equipped with 160Gbytes or more may not be recognized, depending on the device.
When selecting USB function,file reading 
When playing a USB device,there may be a delay then advancing to the next track,especially with HDD.
If the external USB storage device supports only USB VER1.1 and the access speed is slow,the file may not property.
Connect the external USB storage device to your player. 
Select the USB function by using the FUNCTION button.
, 
button.
Whenever you press the button, you can search backward or forward quickly.
When you use the high speed search function, there is no sound.MM-D330/XE, MM-D320/SQ, MM-D320/EN, MM-D330/EN, MM-D320/RU specifications
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