Replying to I need Help, fast.

Umm, I'm posting this in the NSG cause I need quick help. But i have an external HD, and it wworks greast and all. and has everything of my life in there, and all of a sudden my computer wont recognize it.

it all started in iTunes trying to sync my shuffle with this itunes cause my laptop is at colege. and i just transfer the HD...but yea, all of a sudden i went to play a song, and it couldn't find it. I was like wtf? then I went to MY Computer, and F: drive isn't there! I need help fast, cause htis is freakin stupid.