I assume you're trying to import .mp3 from a FAT32 formatted USB stick?
I've just spent the weekend uploading tonnes of music onto the wife's HDD in the new 40d and I found that you have to wait a little while (15 secs or so) from when you plug the stick in to when the system recognises it's presence and gives you the import option. Upload via USB is quite quick and a lot faster than ripping from a CD onto the HDD.
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2012 BMW F10 520d M-Sport
2010 BMW E70 X5 xdrive40d
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