Need to know the actual differences in specs for the formats? Check out the table below to see how they all compare.

Storage capacity (per layer)	15GB	25GB	4.4GB
Theoretical Storage Limit	60GB	200GB	N/A
Approx. Transfer rate (MB/S)	36.5	36	5
Laser Wavelength (Nanometres)	405NM	405NM	650NM
Max Resolution	1080P (1920x1080)	1080P (1920x1080)	480P (720x480)
Disc thickness	0.6MM	1.1MM	0.6MM
Protective Layer	0.6MM	0.1MM	0.6MM
Titles available by Jan 08	330	360	50,000+
Backwards Compatible	Yes	Yes	N/A