Testing For The Next Generation Formats

Formats Comparison	DVD (SL/DL)	HD-DVD (SL/DL)	BD (SL/DL)
Capacity	4.7/9.5 GB	15/30 GB	25/50 GB
Wavelength	650nm	405nm	405nm
Numerical Aperture	0.6	0.65	0.85
Focused Spot Size	~1.08um	~.62um	~.47um
Focus Depth	<1.8um	<0.8um	<0.5um
Tilt Margin/Tolerance	1	0.48	0.9
Track Pitch	0.74um	0.4um	0.32um
Indicative Pit Height	~104nm	~65nm	~65nm
Indicative Pit Width	~280nm	~200nm	~160nm
Minimum Feature Size	~400nm	~200nm	~149nm
Reference Scanning Velocity	3.49/3.84m/s	6.61m/s	4.92m/s
Data Encoding Method	EFM+	ETM	17PP
Reference Channel bit Rate	26mbps	65Mbps	66Mbps
Data Detection Method	Conventional Slicer (zero crossing detection)	PRML	PRML
Nominal Cover layer thickness	0.6	0.6	0.1/0.075
Nominal Space layer	0.055	0.025	0.025

BD	Key Measurement Parameters	What it says about the process	Comparison to DVD
	HF Modulation Amplitude	Information on the depth and width of pits	I14/I14H
	HF Resolution	Information of the pit end wall angles	I3/I14
	HF Asymmetry	Information regarding the balance between shortest to longest pits, and how easy it will be to slice the data	Asymmetry
	Reflectivity	Thickness of reflecting layers	Reflectivity
	Jitter Conventional Equaliser-tilt compensated	How well the data approximates the idealized data lengths	Jitter
	Jitter with Limit EQ - tilt compensated (as above)		Like Jitter but with a different method for digitising the data (see detailed description below)
	Random SER (R-SER)	Overall quality of the manufactured disc
	Burst Error Max	Effect of localized defects/problems
	Max total length of Burst Errors

HD DVD	Key Measurement Parameters	What it says about the process	Comparison to DVD
	HF Modulation Amplitude	Information on the depth and width of pits	I14/I14H
	Resolution	Information of the pit end wall angles	I3/I14
	Asymmetry	Information regarding the balance between shortest to longest pits, and how easy it will be to slice the data	Asymmetry
	Reflectivity	Thickness of reflecting layers	Reflectivity
	Jitter (Lead in only)	How well the data approximates the idealized data lengths
	Sber	A measure of the overall quality (random errors)