Typical CD-ROM capacity: Select the closest standard capacity specification for a typical CD-ROM in terms of stored digital data.

Introduction / Context:
Understanding storage media capacities is part of foundational knowledge in computer hardware. CD-ROMs were a standard distribution medium for software and data for many years. This question asks for the typical capacity specification for a CD-ROM in digital data terms.

Given Data / Assumptions:

• The question refers to standard CD-ROM, not DVD or Blu-ray.
• We want capacity expressed as a digital storage figure.
• Common formats include 650 MB and 700 MB discs.

Concept / Approach:
Standard CD-ROMs commonly store approximately 650 MB (earlier standard) or 700 MB (later common variant). The option set includes 650 megabytes, which is a widely recognized specification for a typical CD-ROM. Time-based measures like 74 or 80 minutes refer to audio CD capacity, but the question explicitly requests digital data capacity. Therefore, 650 megabytes is the best answer among the options provided.

Step-by-Step Solution:

Verification / Alternative check:
Historical media specs show 74-minute audio CDs correspond roughly to 650 MB of data capacity, while 80-minute discs map to about 700 MB. Either validates that 650 MB is a standard figure.

Why Other Options Are Wrong:
90 minutes is an audio time length and not the common CD-ROM data rating; “analog portions” is irrelevant because CD-ROM stores digital data; “octal bytes” is not a recognized capacity unit.

Common Pitfalls:
Confusing audio minutes with data megabytes; mixing up CD-ROM (650/700 MB) with DVD (4.7 GB) or Blu-ray (25 GB or more).

Final Answer:
650 megabytes