CD-ROM 1982

1877

Edison's phonograph is the first sound recording machine.

1935

German firm age make the first tape recorder to play magnetized plastic tape.

1960

Invention of the laser, used to scan compact disks.

1982

First music compact disks go on sale.

1990

Publishers issue books as CD-Roms.

1998

First PCs with DVD disk drives. DVD's hold 30 times as much information as CD-Roms.