Years of Primary Use: 1985-Present
Storage Capacity: 550 MB-700 MB
The Compact Disc (CD) was originally created for digital audio in 1982. It was introduced as a read-only PC storage device (CD-ROM) by Philips and Sony in 1985, which also developed the recordable CD (CD-R) several years later. The CD improved on the earlier floppy disks by using lasers to read and later store data, rather than magnetic strips. The CD's initial capacity was an impressive 550 MB of data; however, a high price point on the original CD-Rs, combined with the fact that they could only be written to once, led many people to continue using 3.5-inch floppy disks. Rewritable models were introduced later, but never really took off.