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
