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Since any two distinct polynomials of degree less than agree in at most points, this means that any two codewords of the Reed–Solomon code disagree in at least () = + positions. Furthermore, there are two polynomials that do agree in k − 1 {\displaystyle k-1} points but are not equal, and thus, the distance of the Reed–Solomon code is ...
Writing a DVD at 1× (1 385 000 bytes per second) [5] is approximately 9 times faster than writing a CD at 1× (153 600 bytes per second). [6] However, the actual speeds depend on the type of data being written to the disc. [6] For Blu-ray discs, 1× speed is defined as 36 megabits per second (Mbit/s), which is equal to 4.5 megabytes per second ...
Low-density parity-check (LDPC) codes are a class of highly efficient linear block codes made from many single parity check (SPC) codes. They can provide performance very close to the channel capacity (the theoretical maximum) using an iterated soft-decision decoding approach, at linear time complexity in terms of their block length.
Although DVD was initially intended to prevent a format war in fact one did arise between these two formats. It was resolved with both surviving however: DVD-R predominating for stand-alone DVD recorders and players, and (for computers) most DVD devices being engineered as dual format, to be compatible with both.
Some high-speed CD and DVD drives can use CAV. [specify] It allows for shorter access times because the rotation speed (angular velocity) does not need to be changed when the laser seeks across the disc, similarly to the magnetic head of a hard disk drive. With a given angular (rotation) speed, the linear speed at the outermost track is nearly ...
Data position measurement (DPM) is a CD and DVD copy protection mechanism that operates by measuring the physical location of data on an optical disc. Stamped CDs are perfect clones and always have the data at the expected location, while a burned copy would exhibit physical differences. DPM detects these differences to identify user-made copies.
The Zone-CLV recording strategy is easily visible after burning a DVD-R. Zoned constant linear velocity (ZCLV or Z-CLV) is a modification of CLV for high speed CD and DVD recorders where a constant linear velocity is maintained until the next zone, when the speed is stepped up. Early model recorders were CLV drives.
The technology is inherited from the ATIP code used on CD-R discs. If the DVD burner recognizes the discs it means that the disc has been tested by the drive manufacturer to achieve the best possible burn using an optimal write strategy. The strategy is stored in the firmware. Writing to a disc with no MID code or a code that is not recognized ...