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Data in a recording frame, except for the sync bits, are modulated using the 1-7PP technique, an RLL (1, 7) code (2T through 8T run lengths) where the first P stands for parity preserve and the second P stands for prohibit repeated minimum transition run length (RMTR) Parity preserve means that the parity of the data stream matches the parity of the modulated stream That is, if the number of ones in the selected chunk of data is even, then the number of ones in the modulated bits is even, and the same if the number of ones is odd This is an efficient way to control the low-frequency content of the recorded signal Prohibit RMTR limits the number of consecutive minimum run lengths (2T) to six, which avoids low signal levels and improves readout performance A modulation conversion table is used to map sequences of data bits to modulation bits, which are then converted to a non-return to zero inverted (NRZI) channel bit stream that is recorded on the disc
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The smallest unit for recording data is a recording unit block (RUB) consisting of 2,760 channel bits of run-in, followed by a 64KB physical cluster, followed by 1,104 channel bits of run-out A continuously written sequence of one or more RUBs is terminated with a guard_3 field of 504 channel bits The run-in and run-out provide buffers so that clusters can be randomly written and rewritten, and to allow for start position shift (SPS), which randomly shifts the start position of each recording sequence by up to 128 channel bits before or 127 channel bits after the nominal start position to help the recording material last longer through multiple overwrites of the same data The lead-in at the beginning of the disc contains a pre-embossed section, called the permanent information and control data (PIC) zone, followed by a rewritable section The PIC
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zone holds general information about the disc and includes a special section called the emergency brake (EB) Up to 62 emergency brake fields can be defined, which specify a drive manufacturer, drive model, and firmware version, with associated special handling procedures to avoid damage to the drive or disc The rewritable section is used for optimum power control (OPC) tasks and to store information about the recorded data on the disc, including defect management information, physical access control, and drive-specific information Discs must be initialized before use, which largely consists of creating a defect list, if any
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Defect management during recording can be handled by the file system or by the drive If the drive manages defects, it maps defective clusters using linear replacement and a single defect list into one or two optional spare areas per layer The inner spare area of layer 0 is at the inner side of the data zone and has a fixed size of 4,096 physical clusters (256 megabytes) The outer spare area of layer 0 and the inner spare area of layer 1 each have a variable size of 0 to 16,384 clusters (1,024 megabytes) The outer spare area of layer 1 has a variable size of 0 to 8,192 clusters (512 megabytes) The total spare areas represent about 5 percent of the storage capacity of the disc If the drive detects a defective physical cluster it may replace the cluster, mark it for future replacement, mark it as defective without replacement, or ignore the error
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Phase-change recording technology, used for BD-R and BD-RE, as well as other optical recording technologies such as CD-RW, DVD-RW, DVD-RAM, DVD+RW, depends on changes in reflectivity between the amorphous state and the crystalline state of special alloys When the alloy is heated by a laser at low power (bias) to reach a temperature around 200 C (400 F), it melts and crystallizes into a state of high reflectivity When the alloy is heated by the laser at high power (peak) to a temperature between 500 and 700 C (900 and 1300 F), it melts and then cools rapidly to an amorphous state in which the randomized atom placement causes low reflectivity As the disc rotates under the laser, it writes marks with high-power pulses and erases between the marks with low-power pulses The marks can then be read with a much lower power setting to sense the difference in reflectivity (see Figure 54) Figure 54 Phase-Change Recording
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