And to read or write a Blu-ray disc, you use a laser to write even smaller still. A DVD uses a red laser beam that makes light waves with a wavelength of 650 nanometers (0.00000065 meters, or less than one hundredth the width of a human hair). That's considerably shorter than the...
PANASONIC UB420P 4K UltraHD HDMI Multi System Blu Ray Disc DVD Player A B C Region 1 2 3 4 5 6 DVD - 6 Feet HDMI Cable Region Free Blu-ray $267.71 Panasonic Compact Stereo System with CD Player, Bluetooth, FM Radio and...