The flash media does not last as long as the optical media. Flash media is about the moment and will not be supported for as long.
optical
SIC 3695 covers making optical recording media
Portable means easy to carry round, Optical means uses light to make it work. So optical media could be portable.
Only if it is a CD containing a film/something that you can watch. CDs with music aren't optical media.
Optical media include CD-ROMs, DVD ROMs, and Blu-Ray disks.
No. A disk drive can use one of several methods of storing data, including magnetic, Flash, and optical.
a DVD and CD
disc
The U.S. magnetic and optical recording media industry employed 20,869 people in 1997
The U.S. magnetic and optical recording media industry employed 15,030 people in 2000
CD and DVD disks are used by optical disc drives.