The U.S. Bureau of Census reported that the magnetic and optical blank media industry earned revenues in excess of $5.9 billion in 1997
The magnetic and optical recording media industry manufactures blank audio and video recording tape, computer tape, and both rigid and floppy computer disks
The U.S. magnetic and optical recording media industry employed 20,869 people in 1997
The magnetic and optical recording media industry is a modern phenomenon, its emergence stemming from technological advancements that began following World War II
The U.S. magnetic and optical recording media industry employed 15,030 people in 2000
This classification comprises establishments primarily engaged in manufacturing blank tape, disk, or cassette magnetic or optical recording media for use in recording audio, video, or other signals
Microfiche
Magnetic storage optical storage solid-state storage storage capacity
By the end of the twentieth century, approximately 241 U.S. companies were involved primarily or exclusively in the manufacture of magnetic and optical recording media
Magnetic media like a hard disk drives are fairly fast so it is suitable for multimedia applications. Optical media like DVDs and CDs are much slower.
One storage device is RAM. Also Magnetic Media, Flash Media, and Optical media. Your welcome :)
NAICS Code 334613 refers to Magnetic and Optical Recording Media Manufacturing
"Disc" refers to optical media, such as CDs or DVDs. "Disk" refers to magnetic media, such as hard drives. So the answer depends on which drive you are referring to; most have both an "optical disc drive", and a "hard disk drive".