Compact disc
Videos
The compact disc is a digital optical disc data storage format co-developed by Philips and Sony to store and play digital audio recordings. It employs the Compact Disc Digital Audio standard and is ca
The readable surface of a compact disc is iridescent because it includes a spiral track wound tightly enough to cause light to diffract into a full visible spectrum.
Dutch inventor and Philips chief engineer Kees Schouhamer Immink was part of the team that produced the standard compact disc in 1980
Sony Discman D-E307CK portable CD player with 1-bit DAC
Pits and lands of a compact disc under a microscope
Blu-ray
Videos
Blu-ray is a digital optical disc data storage format designed to supersede the DVD format. It was invented and developed in the early-mid 2000s and released worldwide on June 20, 2006, capable of sto
Reverse (data) side of a Blu-ray. Unlike CD and DVD, the reflection has a blue hue. Branded colors include silver, gold, and grey.
Early 4K Blu-ray release at Best Buy. A 4K Blu-ray Disc player was also released.
Blu-ray case (often blue-tinted)