When you burn from CD to CD it's essential that there is a "constant stream" of data going to the target drive (blank CD) at all times. If the stream dries up , even for a split second, then the burn will fail.
Think of it like a bath where the taps are on, and the plug is out too. So water (music) is coming out of the taps (from original CD) into the bath and straight out of the bath down the plug hole (to blank CD). So long as there is a backlog of water in the bath, everything is fine, but if it runs out things will go wrong.
If the source drive (original CD) is fast and the target drive (blank CD) is a bit slower then the stream will probably never dry up. But if it's not ... or if your PC suddenly decides to do something else (eg an eMail arrives and AntiVirus decides to take a look at it) ... then the stream could dry up and the burn could fail.
Which brings us back to the observation that others have already stated ... better to stream the original CD to the Hard Drive, then stream from the Hard Drive to the target CD. The stream from the Hard Drive can be read very quickly indeed, and the burn is much less likely to fail unless something very significant happens.
RC