Samsung DVD-R129XAA, Руководство по обслуживанию

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EFM/EFM+ demodulation is performed by detection, protection and
insertion of bit stream transferred from PRML in terms of synchronization
signal, and generation of internal synchronization signal.
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Data is transferred to DP2 in order to be stored in buffer memory.
During encoring, the position information is identified by land pre-pit(LPP)
data, PID or address in pre-groove(ADIP).

After performing EFM+ 8/16 modulation by requesting data stored in
buffer memory embedded in DP2, data related to DVD format such as
SYNC, Guard1, VFO3, PS, Guard2 and etc. are added and NRZI bit
stream transformed in order to facilitate record propagate through Write
Strategy Block.
Data Processor I (DP1)