Samsung DVD-R129, Service Manual, Page: 185 / 208

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The data size for data transfer between internal buffer memory and
each functional block of data processor is dependent upon disc media.
Data is transferred by 2 symbol units(2bytes, 16bits) in the case of DVD
and 2 symbol units(1bytes, 8bits) in the case of CD and BCA. The
microprocessor deals with memory management.

The microprocessor manages DVD data by 1 ECC block unit and CD
data by frame unit automatically.

BCA data is stored at the specific location of memory and managed. In
the case of an external buffer memory, the microprocessor is also in
charge of memory management and the buffer control block of ATAPI
deals with the a serious if data transfer process.
Data Management