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ils arrivent : http://www.tdk-europe.com/products/fr/datastr/recordablecd/hcr.html

TECHNICAL SPECIFICATIONS

Physical dimensions
Outer diameter mm 120.0 ±0.3
Inner diameter mm 15.0 +0.1/-0
Total thickness mm 1.2 +0.3/-0.1
Recording area mm 44.7 ~118
Track pitch µm 1.33
Material
Substrate Polycarbonate
Recording layer Organic dye
Reflective layer Silver
Protective layer ultrapure UV-cured resin
Optical characteristics
Reflectivity % >60
Recording/playback characteristics
Recording capacity MB 800
min 91
Scanning velocity m/s 1.2
Read stability more than 1 mio times
Environmental conditions
Recording °C -5 ~55
%RH 5 ~95
Playback °C -40 ~70
%RH 10 ~95