Burst cutting area
In computing, the burst cutting area (BCA) or narrow burst cutting area (NBCA) refers to the circular area near the center of a DVD, HD DVD or Blu-ray Disc, where a barcode can be written for additional information such as ID codes, manufacturing information, and serial numbers. The BCA can be written during mastering and will be common for all discs from that master or, more usually, will be written using a YAG laser to "cut" the barcode into the aluminum reflective layer of the finished disc, potentially adding a unique barcode to each manufactured disc.
The data stored in the BCA can be from 12 bytes to 188 bytes in steps of 16 bytes. The BCA can be read using the same laser for reading regular data, but requires special circuitry to be decoded. It is not mandatory for DVD players to support reading the BCA, but DVD-ROM drives should, according to the Mt. Fuji specification (an industry-standard optical drive command set). The Burst Cutting Area cannot be written without using special equipment, therefore it can be used as a tamper-proof means of identifying individual discs.
The DIVX format used BCA to uniquely identify every disc. Information for CPRM is stored in the BCA of a DVD-RAM or DVD-R/RW disc. Nintendo optical discs use a BCA mark to prevent the use of copied discs and homebrew games. On Blu-ray discs a Pre-recorded Media Serial Number (PMSN) can be stored in the BCA. CD-RW drive makers did find a way to add them to burned disks making it no longer useful for DRM.
- DVD Specification
- INF-8090, Mt. Fuji Commands for Multimedia Devices Version 8, Section 2.2.13, ftp://ftp.seagate.com/sff/INF-8090.PDF
- ExtremeTech. CPRM for DVD-RAM
- ExtremeTech. CPRM for DVD-R/RW
- Ecma International. Standard ECMA-267: 120 mm DVD - Read-Only Disk.
- DVD Forum. DVD Specification: Part 1, Annex K.
- Blu-ray Disc Association. BD ROM - Physical Format Specifications (March 2007).
- OSTA. "Understanding DVD: Disc Construction and Manufacturing".
- OSTA. "Understanding DVD: Copying Deterrents and Content Protection".
- DVD FAQ. "What is BCA or NBCA?".
- DVD Demystified Glossary. "BCA".
- DVD Burning Glossary. "BCA - Burst Cutting Area".