Not sure I understand the problem on your first question - are you able to make 99 copies but not 101?
Also a little more detail on the second question would help. Are you trying to record a DVD movie, or audio files from a DVD? And what kind of mag tape? Is it analog (VHS, Beta) or digital (miniDV, digibeta)? What hardware do you have that you want to do this on, or are you willing to get whatever hardware you need? Tell us so we can tell you!