Stories by Hamish Macarthur

Through a Glass Clearly

The emergence of the CD-ROM format created a standard around which optical data storage could consolidate. If the 1990s saw economic improvement from optical disk, the 21st Century is seeing technological improvement. If the diameter of a spot recorded on an optical disk is halved, the storage density is improved by a factor of four, so is the amount of energy available to write a spot. CD technology was designed for 830nm wavelength lasers, essentially giving an 830nm spot, although finally 780nm lasers were used.