Question
A DVD uses the _____ method to store and read data.
The correct answer is
optical
The question asks about the specific method a DVD uses for storing and reading data.
DVD Data Storage Method Explained
A DVD (Digital Versatile Disc) is a type of optical disc storage medium.
- Optical Method: DVDs store data as microscopic pits and lands on a reflective surface. A laser beam reads this data by detecting the changes in reflectivity as the disc spins. Writing data involves using a higher-powered laser to create these pits. This reliance on light (lasers) makes it an optical method.
- Other Methods:
- Electrical storage typically involves electronic circuits and memory chips (like RAM or flash drives).
- Magnetic storage uses magnetic fields to store data (e.g., hard drives, floppy disks).
- The Hall effect is a physical phenomenon related to magnetic fields and charge carriers, not a data storage method itself.
Therefore, the correct method used by DVDs is optical.
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Important Questions from Optical Devices
Which computer application scans texts and converts into readable form in computer?
In optical communication using silica optical fiber, 1 nm spectral width at 1300 nm corresponds to a bandwidth of (assume refractive index of silica optical fiber = 1.5)
An LCD requires a power of __________.
- The slope efficiency of a laser diode is 0.5 W/A, and the output optical power at a current of 100 mA is 30 mW. Assuming piece-wise linear characteristics of the laser diode, the threshold current of the laser is ________ mA.
- TV remote controls commonly use _____ to communicate with the TV.
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