Blu-ray rewritable volumes are not sequential. The drive unit leads the read-modify-write operation and defect management. So, there are no need for table storage and mapping table and the virtual file system.
Blu-ray factors, the impact on the UDF are:
2k bytes of logical sector and 64 bytes for ECC-Block
For BD-RE, BD-R and BD-ROM, there are several requirements for the UDF volume and file structure and are individuallydefined in different specifications for each of the types referred to above average. It is also noted defect management in Blu-ray recordable discs. This feature eliminates the need to protect the table in the file system. The requirements for Blu-ray read-only is easier and therefore do not need to read-modify-write, overwrite, incremental recording of user data. The defect management system allows the replacement of the defective cluster, and to allow the logicOverwriting of previously recorded user data.
The recording of digital broadcasts in BD-RE
The BD-RE recording application form takes MPEG-2 TS (Transport Stream) for streaming and multiplexing of MPEG-2 codec for video. Multiplexing in the video DVD, uses MPEG-2 PS (Program Stream). Than MPEG-2 PS, MPEG-2 TS has established a small package size to 188 bytes, allowing more channels and EPG (Electronic Program Guide) information and is multiplexeda total of more dynamically. The BD-RE Application Format allows transport streams from digital transmissions recorded, as is without any quality loss.
In the current BS digital broadcasting is a transponder occupied by two or four streams of transport and more programs (ie programs) are multiplexed into a single transport stream. A transport stream as it is used for broadcasting and contains a number of programs is known as a complete transportationStream. The flow of transport from the partial transport stream to extract the full audio / data / video of a specific program and reconfigure the program specific information / service information (PSI / SI), information describing the programs is done. The audio / data / video channels to be recorded side and use the reception area, if it were a digital broadcast recorder to record a full transport stream in its original form. The conversionthe full partial transport stream is an important process for the recorder. This conversion process allows the recording area to be used efficiently, reducing the sampling frequency.
The time intervals between packets are not always the same, in a part of the transport stream, which reconstructs the transport stream packets required by full extracts. This package ranges are determined by the pattern buffer. Packages must be observed when packets are inputDemultiplexer / decoder, or the buffer overflow or underflow and the data is correctly decoded. To overcome this problem is a header), each TS packet while recording STD to specify the time that the packet arrived at the TS stream transport system target decoder (T-TS packet to its arrival time of packets in the Annex is a source package with the BD-RE Application. During playback, the packets are given intervals before shootingrecorded the exact time of arrival of the packet header of the source package and then package for the T-STD or outside the unit.
When recording a transport stream to disk, the information from other programs and other unwanted information from / PSI and SI information deleted and reconfigured the image is processed in accordance with copyright information, but there are no changes to the encoded data required level (Elementary Stream), asDown-conversion or re-encoding, image and affect the sound quality. This is like the BD-RE Application Format allows the Hi-Vision video that has a maximum bitrate of 24 Mbit / s can have multi-channel audio, while the original recording of broadcast quality.
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