3695 Magnetic And Optical Recording Media Establishments primarily engaged in manufacturing blank tape, disk, and cassette magnetic and optical recording media for use in recording audio, video, and digital signals. Establishments primarily engaged in manufacturing blank or recorded records and prerecorded audio tapes are classified in industry 3652; those manufacturing prepackaged computer software are classified in Services, industry 7372; and those manufacturing prerecorded video tape cassettes and disks are classified in Services, major group 78.