On Sat, 23 Mar 2013, Jerome H. Fine wrote:
  Since a DVD drive can read both a CD and a DVD (as
well
 as, for many drives, but not all) burn both a CD and a DVD,
 the media can't be that different.  However, since my DVD
 drive is able to distinguish between a DVD blank and a CD
 blank, I assume that the media must be somewhat different. 
Is there some info pre-recorded?