Information Communication Technology ICT – 3 Storage devices and media | e-Consult
3 Storage devices and media (1 questions)
Login to see all questions.
Click on a question to view the answer
CD (Compact Disc):
- Data Capacity: Approximately 700MB.
- Technology: Uses a laser beam to read pits and lands (bumps and flat areas) on the disc's surface. The laser reflects differently from these areas, representing binary data (0s and 1s).
- Advantages: Relatively inexpensive, widely compatible with older devices.
- Disadvantages: Low storage capacity compared to newer formats. Susceptible to scratches and dust.
DVD (Digital Versatile Disc):
- Data Capacity: Single-layer DVD: 4.7GB; Dual-layer DVD: 8.5GB.
- Technology: Similar to CD, but uses a shorter wavelength laser to read smaller pits and lands, allowing for higher data density.
- Advantages: Higher storage capacity than CDs, suitable for storing larger files like movies.
- Disadvantages: Still susceptible to scratches. Dual-layer DVDs can be more fragile.
Blu-ray Disc (BD):
- Data Capacity: Single-layer BD: 25GB; Dual-layer BD: 50GB. Triple-layer BD: 100GB.
- Technology: Uses a blue laser with a shorter wavelength than DVD, enabling even smaller pits and lands and significantly higher data density.
- Advantages: Highest storage capacity, ideal for high-definition video and large data archives.
- Disadvantages: More expensive than CDs and DVDs. Requires a Blu-ray compatible drive.