m250 V4.18A disabling external HD - Help Please

Hi,

I just purchased this yesterday and it seems that to add songs I have to put them on my desktop (C Drive). When I try to transfer songs from my external HD i get the ‘Cannot find specified path. Make sure you specified the correct path’ message and when i have the mp3 player connected and my HD at the same time, I cannot play anything from my HD. Any Ideas?