Which of the following storage media from the list A-E given below are optical…
2022
Which of the following storage media from the list A-E given below are optical storage media only?
(A) DVD RAM
(B) Pen drive
(C) Magnetic tape
(D) SSD
(E) Blu-ray disc
Choose the correct answer from the options given below:
Answer: D. A and E only — CONCEPTOptical storage records data as physical changes in a disc and uses a laser to read or write those changes. Magnetic storage uses magnetized material,…
- A.
B, C and D only
- B.
A and B only
- C.
D and E only
- D.
A and E only
Show answer & explanation
Correct answer: D
CONCEPT
Optical storage records data as physical changes in a disc and uses a laser to read or write those changes.
Magnetic storage uses magnetized material, while flash storage stores charge in semiconductor memory cells; neither mechanism is optical.
APPLICATION
Medium | Storage mechanism | Classification |
|---|---|---|
DVD-RAM | Phase-change disc read and written with a laser | Optical |
Pen drive | Charge stored in semiconductor flash-memory cells | Solid-state, non-optical |
Magnetic tape | Magnetized regions recorded on tape | Magnetic, non-optical |
SSD | Charge stored in semiconductor flash-memory cells | Solid-state, non-optical |
Blu-ray Disc | High-density disc read with a blue-violet laser | Optical |
CONTRAST
B, C and D combine two flash-memory devices with magnetic tape.
A and B combine an optical disc with a flash-memory device.
D and E combine a flash-memory device with an optical disc.
A and E contain two laser-accessed optical-disc formats.
RESULT
Therefore, the optical-only option is “A and E only.”