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Important terms
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10.3 Buffer under-run
A continuous stream of data is required when you write on a CD. In other
words, the data flow must not be interrupted. For example, data is written at a
rate of 352 kB / per second at a 2x writing speed.
words, the data flow must not be interrupted. For example, data is written at a
rate of 352 kB / per second at a 2x writing speed.
Because the computer does not supply a constant flow of data (the data is
transferred in blocks), a CD recorder has a buffer (intermediate memory) in
which the data transmitted by the computer is temporarily stored and then sent
to the writing laser at the correct rate.
transferred in blocks), a CD recorder has a buffer (intermediate memory) in
which the data transmitted by the computer is temporarily stored and then sent
to the writing laser at the correct rate.
If the computer does not succeed in keeping the buffer full during the writing
process (i.e. the buffer becomes completely empty), the writing laser does not
have any more data and the burning procedure has to be broken off. This is
known as 'buffer under-run'.
process (i.e. the buffer becomes completely empty), the writing laser does not
have any more data and the burning procedure has to be broken off. This is
known as 'buffer under-run'.
It is normally impossible to write any more on a CD following a buffer under-
run - the compact disk is defective. (However, as a rule, it will be possible to
play those parts of the CD that have already been written on).
run - the compact disk is defective. (However, as a rule, it will be possible to
play those parts of the CD that have already been written on).