Memory volatility — selecting the volatile technology Which of the following memory types is volatile (loses data when power is removed)?

Introduction / Context:
Computer systems use both volatile and nonvolatile memories. Volatile memories require continuous power to retain data and are typically used for working storage. Identifying which category a memory belongs to is crucial for system design and data integrity planning.

Given Data / Assumptions:

• Volatile: RAM (SRAM, DRAM) loses data when power is removed.
• Nonvolatile: ROM, PROM/EPROM/EEPROM/Flash retain data without power.
• “EROM” is not a standard mainstream term; assume it is not the intended volatile choice.

Concept / Approach:
RAM stands for Random Access Memory and is used for temporary, high-speed storage during program execution. Dynamic RAM needs refresh even while powered, and all RAM loses content on power loss, making it volatile by definition.

Step-by-Step Solution:
List categories: RAM (volatile) vs. ROM/Flash (nonvolatile).Determine which loses data without power: RAM.Therefore, select RAM as the volatile memory.

Verification / Alternative check:
System behavior during reboot confirms this: contents of main memory vanish, while firmware stored in ROM/Flash persists to boot the machine again.

Why Other Options Are Wrong:

• ROM and Flash: Nonvolatile; retain contents across power cycles.
• EROM: Not a standard volatile memory classification; even if interpreted as erasable ROM, it would still be nonvolatile when unpowered.

Common Pitfalls:

• Assuming “random access” implies nonvolatility; it describes access method, not retention.
• Confusing EEPROM/Flash erasability with volatility; they keep data without power.

Final Answer:
RAM