Optical Disk Media
Magnetic hard disks have been around since the 1950s and are now in computers, MP3 players and video cameras. Optical storage is somewhat newer, coming out of videodisks and the compact disk in the 1980s. Both technologies are still evolving rapidly, offering more storage space at lower costs.
Speed
Magnetic disk storage has been optimized for high speeds. DVDs and CDs access data fast enough to play movies and music, but are much slower than a magnetic disk.
Portability
Since the disk is small, light and removable, optical media is portable. Most magnetic disks, while lightweight, are meant to stay inside the computer.
Cost
Neither magnetic hard disks nor optical disk drives are expensive, though optical drives go for a fraction of what a hard disk costs.
Storage
As of 2009, magnetic disk drives with trillion-byte (terabyte) capacities had become common. Individually, dual-layer Blu-Ray optical disks store 50 billion bytes (gigabytes).
Purpose
Magnetic disks have been a workhorse technology for computers since the 1950s. They're the main place to keep files and software. Optical disks are handy media for portable data, movies and music.
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