What is the primary difference between a CD and a DVD?
A. CDs are read-only; DVDs are rewritable
B. DVDs use a shorter wavelength laser, allowing higher density
C. DVDs are older technology
D. CDs store more data than DVDs
Answer: Option B
Solution (By JKSSB Mock Tests)
DVDs use a shorter wavelength laser (650 nm vs 780 nm for CDs), which allows smaller pits and tighter tracks, resulting in higher storage capacity (4.7 GB vs 700 MB).
Explanation:
The scaling path for binary exponents places $2^{10}$ as KB, $2^{20}$ as MB, $2^{30}$ as GB, $2^{40}$ as TB, $2^{50}$ as PB, and $2^{60}$ bytes as 1 Exabyte (EB).
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