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Thermo-Balanced Writing
Equally of course,if the pits come out too small or too light,then other reading errors can occur.If a CD-R
drive has no way of controlling the burn process,to adapt itself to the nature of the media,then the use of such
sub-standard discs is far more likely to result in defective recordings and,more importantly,severe End-user
disappointment.
Fig.1,Thermo-
Balanced Writing:
Typical Heat Profile
during CD-R write
phase.Goal of TBW is
to ensure a correctly
balanced heat profile
during this phase.
Fig.2,Thermo-
Balanced Writing:
Pit & Land Cross
section. A build
up of Thermal
“cross-talk”during
successive “burns”
creates pits
with variable
dimensions,and
the possibility of
errors when data is
read back.
temperature
laser beam
required temperature to
burn a pit
diameter of pit is smaller
than diameter of laser spot
laser spot
62200223-TBW 21-02-2001 16:15 Pagina 6