Which memory type can only be accessed and not overwritten?

Which memory type can only be accessed and not overwritten?

• A. RAM
• B. ROM
• C. Flash
• D. Cache

Answer: (B)

The correct choice is ROM, which stands for Read-Only Memory. This type of memory is specifically designed to be accessed for reading data but not to be written to or overwritten in the traditional sense. Once data has been written to ROM during the manufacturing process, it is permanently stored and cannot be changed easily. ROM is essential for storing firmware, which is low-level software that allows hardware devices to boot up and function properly. Because this data does not need to change, ROM ensures that the crucial instructions for starting and operating a device remain intact. In contrast, RAM (Random Access Memory) is volatile memory that can be both read and written to, making it necessary for temporary data storage while a device is operational. Flash memory allows both read and write operations, enabling data to be stored and modified as needed. Cache memory, which is used to speed up data access for the CPU, is also writable. Thus, ROM's defining feature of being read-only is what clearly distinguishes it from these other memory types.

The correct choice is ROM, which stands for Read-Only Memory. This type of memory is specifically designed to be accessed for reading data but not to be written to or overwritten in the traditional sense. Once data has been written to ROM during the manufacturing process, it is permanently stored and cannot be changed easily.

ROM is essential for storing firmware, which is low-level software that allows hardware devices to boot up and function properly. Because this data does not need to change, ROM ensures that the crucial instructions for starting and operating a device remain intact.

In contrast, RAM (Random Access Memory) is volatile memory that can be both read and written to, making it necessary for temporary data storage while a device is operational. Flash memory allows both read and write operations, enabling data to be stored and modified as needed. Cache memory, which is used to speed up data access for the CPU, is also writable. Thus, ROM's defining feature of being read-only is what clearly distinguishes it from these other memory types.