[charlie_ps2]

Two points in reply.

1/
Nero won't do 1:1 copies so far as I know. It needs CloneCD.

2/
You don't mention your burner. But you do mention buffer-underrun.

This usually occurs because you are burning too fast and/or something else is running on your PC (like Anti-virus has kicked in, or you are on-line).

It can also occur because your hardware is not optimally set up. The source channel should be different from the destimation channel. For example, the HDD would be on the primary IDE channel as the Master; the CD burner would be on the secondary IDE channel as the Master. You pribably know this anyway.

Hope that helps.