How does the EMPEG handle a second harddrive?, i.e how does it begin to fill this drive, does it completely fill the first before it stores MP3's on the 2nd?

It puts each file on the disk with most free space. Thus if you have a half-full 10G disk and add a new 48G, everything will go on the 48G disk until it too has only 5G of space left.

Peter