TDK achieves 200GB Blu-ray disc milestone
recently divulged its plans to develop a Blu-ray disc with eight
times the capacity of 25GB single-layer variants, TDK has now
announced that it has successfully hit the 200GB mark in its labs.
According to Reg Hardware, the company abandoned its plans to produce an
eight-layer disc and instead used a new recording medium in order to
achieve the 200GB capacity with just six 33GB layers. The medium is said
to use bismuth peroxide, which is heated with a laser in
order to form air bubbles that are then treated as bits of data.
However, Reg Hardware rightfully adds that "since the density of the
bubbles is clearly different from that of a standard BD - hence the
higher capacity - it's unclear whether a BD-compatible drive could
actually read one of these things." Of course, the 200GB discs are still
at the prototype stage and presumably some time away from commercial
production. 25GB recordable Blu-ray discs are already
shipping, but even 50GB dual-layer ones won't appear until later
this year, and 100GB quad-layer variants aren't expected until 2007.