Question: CD-R's can be written only once, because a) Bits are packed so densely that the change of any of them would porduce a cascade of

CD-R's can be written only once, because
a) Bits are packed so densely that the change of any of them would porduce a cascade of changes of its
b) Lasers destroy the magnetic charge irreversibely
c) Lasers burn the surface of the disk

not only one can be correct

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