you dont import from a USB. You store your music on it.
I think what you are looking at is ripping a music CD which I believe you can directly into the unit. I believe it has an internal hard drive. Im not 100% on its capacity though.
First question i would have is what are you trying to do.
If you want to play music from a USB that you have stored on your computer in say mp3 format. Then Format your USB with FAT32 and copy the files across. Then pop usb into car and away you go
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