(4.7 Gb) Now

: Contrast this with the 700 MB capacity of the CD-ROM.

: Explain the transition from the red lasers used in CDs to the more precise optics that allowed for tighter data packing on DVDs. (4.7 GB)

: Briefly mention how later "blue/violet" laser technologies (Blu-ray) further compressed data to reach 25 GB+. : Contrast this with the 700 MB capacity of the CD-ROM

: Define 4.7 GB as the standard capacity for a single-layer DVD-R. (4.7 GB)