Part of the storage device of CD-ROM in computer
- 2. Storage Devices •Store data even when the computer is turned off. •Keep important data and files use on permanent basis.
- 3. Categories of storage devices Storage Devices Magnetic Storage Optical Storage
- 4. CD-ROM • Compact Disk – Read only memory • Optical disk • Used to store digital data • Storing digital audio
- 5. CD Structure A CD is flat, round, portable metal disc, which is coated with a thin metal or plastic or other material that is highly reflective. It is usually 0.75 inches in diameter and less than one twentieth of an inch thick.
- 6. Storage capacity of CD-ROM Maximum limit of data storage on a CD Standard compact disc can store 650 MB of data About 70 minutes of audio New generation of compact disc however, can hold 700 MB data 80 minutes of audio
- 7. Large storage space Compact and light Can be manufactured on a large scale Slow writing speed Not easily re-writable Cost concerns CD-ROM Advantages Disadvantages