BURN-Proof (Buffer Under Run Error Proof) is a technology developed by Sanyo that allows compact disc (CD) recording to automatically stop in the event of an unplanned interruption and then to resume recording. BURN-Proof is a registered trademark of Sanyo. When a CD is burned (recorded), the data must usually be written onto the CD without any interruption. If an interruption, such as the opening of a new application, does occur, a Buffer Under Run error occurs and the burn is unsuccessful. BURN-Proof technology located on firmware inside the CD-R or CD-RW drive monitors the recording process. If the drive detects a Buffer Under Run error, it suspends recording. When the problem is resolved, the CD-R or CD-RW drive restarts recording data from where it stopped. BURN-Proof technology is used with CD drive speeds 12X and higher because Buffer Under Run errors occur more often with faster drives. Many CD recording application vendors provide BURN-Proof support with their software.From http://www.feurio.net/English/faq/faq_vocable_burnproof.shtml:
Question: How does it work, anyway? At "Buffer-Underrun" you can read, that it is impossible to start over at exactly the same position where the process has been interrupted? Answer: At first you have to keep in mind that even Burn-Proof does not succeed in resuming EXACTLY the same position where the process has been interrupted. But Burn-Proof is able to "resume" good enough to keep the defective area very small. Later, the CD-Player will "believe" it is only a small scratch on the CD. Usually the error correction of the CD-Player will correct such minor errors itself. When "Burn-Proof" is used, the data can be basically provided at any speed you like - the CD-Writer simply stops if not enough data is available. You will find further information about Burn-Proof on the "Burn-Proof homepage" ( http://www.burn-proof.com/).