Until now, only write-once BD-R XL discs were available on the market.
The new rewritable BDXL (BD-RE XL) media conform to the RE4 Format Specification (BDXL), defined by the Blu-ray Disc Association (BDA) in June 2010 as a multi-layered rewritable in BDAV with the speed of 2X and 4X. (System Description Blu-ray Disc Rewritable Part 3: Audio Visual Basic Specifications Ver.4.01 Sept. 2010 together with System Description Blu-ray Disc Rewritable Format Part 3: Audio Visual Basic Specifications Ver.2.13 Sept. 2010).
The 2x disc is compatible with Panasonic's recently released BZT900 BDXL recorder and using the DR mode, it can hold up to 12 hours of digital terrestrial (17Mbps) content, or 9 hours of BS digital (24Mbps) content.
Using high-precision layer stack technology, Panasonic has managed to make a 3-layer optical medium with stable recording and playback characteristics. In addition, the discs feature a proprietary protective hard coating technology against scratches and fingerprints.