Sony PDWF75 Family Brochure (XDCAM HD Family) - Page 5

XDCAM HD File-based Disc Recording In addition to its impressive HD picture quality, what makes the XDCAM HD system so distinguished is its file-based disc recording capability. This brings huge benefits such as instant random access and IT connectivity, to name just two. Powerful Nonlinear Recording - the Professional Disc Media The XDCAM HD products use a large-capacity nonlinear optical disc for recording called Professional Disc media, which Sony has developed specifically for professional recording applications. The PFD50DLA and PFD23A are 12-cm, reusable optical discs. The PFD50DLA is a dual-layer disc with an overwhelming capacity of 50 GB, while the PFD23A is a single-layer, 23-GB disc. The large capacity of the PFD50DLA makes it possible to record up to 265 minutes* of HD material. Professional Disc media is highly reliable and durable because it experiences no mechanical contact during recording or playback, and is packaged into an extremely durable and dust-resistant disc cartridge. The non-contact recording and playback also make it an ideal media for long-term storage of AV assets. Whereas traditional tape archive systems must be rewound on a periodic basis to remove magnetic powder debris, the Professional Disc media completely eliminates this process. Its reliability has already been demonstrated by the huge number of XDCAM products that have been in the field since 2004. *This figure is approximate. The precise recording duration will depend on the bit rate selected. PFD50DLA PFD23A The Key Technology Enabling Dual-layer Recording The development of the new dual-layer disc, PFD50DLA has been long-awaited by users who want to achieve a much longer recording time on the XDCAM HD system. This large-capacity dual-layer disc with compatible disc drive, provide four technological advances: 1. Increased recording density and the dual-layer disc structure offer more than twice the capacity of the single-layer disc. 2. The new substrate and production method enhance the stable reflection and transmission of the laser. 3. The new pickup uses much higher laser power enough to record on a dual-layer disc, while maintaining a long life equivalent to the pickup used for single-layer disc recording. 4. The newly developed servo-control mechanism which is resistant to the noises that occur at laser reflections and transmissions at each layer - enables fewer access errors, even in unstable situations. In addition to these new advances, the dual-layer disc provides superb robustness and reliability equivalent to those of the single-layer disc. Single-layer Disc Disc Substrate Recording Layer Cover Layer One Reflection Dual-layer Disc Disc Substrate Recording Layer 0 Space Layer (25µm) Recording Layer 1 Cover Layer (75µm) One Reflection and Two Transmissions Require More Laser Power 5