I found more info on burn proof on
http://ireland.amiga.org/index.html ...
Here is a hardware review of a Plextor with burn proof and it states clearly
'As regards software, I'm using the very comprehensive MakeCD DAO version, but an important point to note is to make sure you have the latest version 3.2d, as this supports BURN-Proof drives. To activate it though, you'll have to set a tooltype in the MakeCD icon. Enter the icon's information window and enter MAKECD_BURN_PROOF as a new tooltype. If you don't, and a buffer underrun occurs, the CD isn't ruined, but MakeCD interrupts writing anyway, as it thinks the CD is ruined. Set the tooltype, and set the writing speed to maximum (0), and away you go: faultless CDs every time!'
so I guess that burn proof is not activated when you install it for the first time ...