problems with my rk27xx
 

hello everyone
i have some problem with my rk27xx of 16 gb:
1. i can not put the music in the device:
when i copy the music from my computer to the mp4 i see that the device copy the music, then when i disconnected from the usb the music disappear, please help with that!!!
2. also when i check the memory of the mp4 i have 11 gb occupied already and i do not have any music in there. how is this possible, how can i take that out???
please help me!!!!!!!
thank you for everything