Question

Storage capacity of CD is .....

• A. 600MB
• B. 1000MB
• C. 700 MB
• D. None of these

Hint:

Remember standard optical disc capacities for competitive exams: CD = 700 MB, standard single-layer DVD = 4.7 GB, and standard single-layer Blu-ray = 25 GB.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
We need to identify the standard storage capacity of a typical CD (Compact Disc) used in computing and audio.


Step 2: Detailed Explanation:
A standard CD-ROM (Compact Disc Read-Only Memory) typically holds a standard maximum storage capacity of 700 MB (Megabytes), which translates to about 80 minutes of uncompressed Red Book standard audio.
While the earliest versions of CDs had a slightly lower capacity of 650 MB (74 minutes of audio), 700 MB quickly became the universally manufactured and accepted standard for CD media worldwide.
Options (A) 600MB and (B) 1000MB do not represent any standard CD capacities.


Step 3: Final Answer:
The standard storage capacity of a CD is 700 MB.

Answer 2

The question asks for the standard storage capacity of a CD. Let's check each option against the well established physical and industry specifications for compact discs.

1. 600MB: This is not a recognized manufacturing standard for any generation of compact disc; no widely produced CD format was ever built or marketed at this exact capacity.
2. 1000MB: A standard 120 mm compact disc uses a fixed track pitch and pit density set by the Red Book specification, and this physical layout caps the achievable capacity well below 1000MB (1 GB). Reaching 1000MB on a disc of this size would require a fundamentally different laser wavelength and pit geometry, which is what later formats like DVDs actually use.
3. 700 MB: This matches the widely adopted standard capacity for a 120 mm CD-R or CD-ROM, corresponding to about 80 minutes of uncompressed audio, and is the figure used across essentially all standard commercial CDs today.
4. None of these: Since 700 MB is both a real and correctly listed standard value among the options, this choice does not apply.

Having ruled out 600MB and 1000MB as not matching any real CD specification, and confirmed 700MB as the genuine industry standard, that is the correct capacity.

Therefore, the correct answer is 700 MB.