A. ROM
B. RAM
C. Cache
D. HDD
E. SSD
Choose the correct answer from the options given below :
Primary Memory Components Identification
The question asks to identify which components listed fall under the category of primary memory.
Understanding Primary Memory
Primary memory, also known as main memory or internal memory, refers to storage locations that the CPU can access directly and quickly. It is essential for the immediate operation of the computer.
- Direct CPU Access: The processor can read from and write to primary memory locations rapidly.
- Speed: It is significantly faster than secondary storage devices.
- Volatility: Most primary memory types (like RAM) are volatile, meaning they lose data when power is turned off, although non-volatile types like ROM also exist within this category.
Analyzing the Components
Let's examine each option:
- A. ROM (Read-Only Memory): This is a type of non-volatile primary memory. The CPU can read data from ROM, used for firmware or boot instructions.
- B. RAM (Random-Access Memory): This is the most common type of volatile primary memory. It holds the operating system, applications, and data currently in use for quick processor access.
- C. Cache Memory: This is a small, extremely fast type of primary memory, usually located on or very close to the CPU. It stores frequently accessed data from RAM to reduce access time.
- D. HDD (Hard Disk Drive): This is a form of secondary storage. It stores large amounts of data non-volatily but is much slower and not directly accessed by the CPU for program execution.
- E. SSD (Solid State Drive): Similar to HDD, SSD is also a type of secondary storage. While faster than HDDs, it is still not considered primary memory.
Conclusion on Memory Type
Based on the definitions, ROM, RAM, and Cache memory are all classified as primary memory. HDDs and SSDs are secondary storage.
Therefore, the correct components are A, B, and C.
Important Questions from Memory Hierarchy
Suppose that the register A and register K have the bit configuration. Only the three leftmost bits of A are compared with memory words because K has 1's in these positions. Because of its organization, this type of memory is uniquely suited to parallel searches by data association. This type of memory is known as
Consider a system with 2 level cache. Access times of Level 1, Level 2 cache and main memory are 0.5 ns, 5 ns and 100 ns respectively. The hit rates of Level 1 and Level 2 caches are 0.7 and 0.8 respectively. What is the average access time of the system ignoring the search time within cache?
Related to computers, what is 'Wetware'?
____ number of lines are required to select __________ memory locations.
A computer has a memory hierarchy consisting of two-level cache (L1 and L2) and a main memory. If the processor needs to access data from memory, it first looks into L1 cache. If the data is not found in L1 cache, it goes to L2 cache. If it fails to get the data from L2 cache, it goes to main memory, where the data is definitely available. Hit rates and access times of various memory units are shown in the figure. The average memory access time in nanoseconds (ns) is ________. (rounded off to two decimal places)
