Information must be recorded so that it can be retrieved at a later time if it is to be used and manipulated fully. Chemistry innovations have ensured that the media for such recordings has remained high-quality, easy-to-use, and inexpensive. Breakthroughs in recording capabilities (higher resolution, faster speed, and color), photographic films, magnetic audio recordings, and digital imaging have also brought advances in recording devices.
In 1955, Reynold Johnson, an American inventor and computer pioneer developed the first disk drive to store computerized data.
The initially used magnetic mediums (tapes, cassettes, compact discs, etc.) were gradually replaced by optical storage media formats (CD-ROM, DVD, Blu-ray, etc.), as these latter allow for better quality and longer durability.
Electronically-magnified image of a CD's storage density
Electronically-magnified image of a DVD's storage density
Electronically-magnified image of a Blue-ray disc's storage density