Optical Media

- Optical media into two groups:
> CDs and DVDs
> CDs store around 700 MB and come in three varieties:
- CD-ROM (read only memory: you can’t change the data on them)
- CD-R (recordable:you can change the data once)
- CD-RW (rewritable: you can change thedata on them over and over)
> DVDs store much more data—around 4 GB