CD and DVD storage technologies are typically classified as computer data storage. They can also be referred to as external storage.
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dvd or usb amount of storage for pictures
The main growth technologies were DVD-ROM drives and writable CD and DVD drives, whereas revenues from floppy drives and cartridge drives had stagnated.
CD & DVD are examples of Secondary Storage Devices.
Look at the Case Logic CD-DVD 336 Capacity Classic CD-DVD wallet for $33. Also Bellagio-Italia's CD-DVD storage binder for $15. Snap-N-Store has a CD Storage Box for about $5. All available at Amazon online.
A DVD. Apex.
Tape, DVD, CD, Floppy Disk
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CD's and DVD's are not magnetic. They are optical storage devices that are read with LASER beams.
All CD, DVD's and blu-ray's are multiplexed optical data storage. This is what movies and music is on.
There are micro craters that a laser "reads"
It is neither, CD DVD and hard disk is STORAGE not input or output.