MCQ
Q.
Which of the following is fastest memory?
Correct Answer: C
The Correct Answer is "Cache Memory".
Important Points
Cache Memory :
- Cache Memory is a special very high-speed memory.
- It is used to speed up and synchronizing with a high-speed CPU. Cache memory is costlier than main memory or disk memory but economical than CPU registers.
- Cache memory is an extremely fast memory type that acts as a buffer between RAM and the CPU.
- It holds frequently requested data and instructions so that they are immediately available to the CPU when needed.
- Cache memory is used to reduce the average time to access data from the Main memory.
Additional Information
Secondary Memory :
- It is non-volatile, i.e. it retains data when power is switched off.
- It is large capacities to the tune of terabytes.
- It is cheaper as compared to the primary memory.
- Depending on whether the Secondary memory device is part of the CPU or not, there are two types of secondary memory – fixed and removable.
Auxiliary Memory :
- Auxiliary memory is the non-volatile memory lowest-cost, highest-capacity, and slowest-access storage in a computer system.
- It is where programs and data kept for long-term storage or when not in immediate use.
- Such memories tend to occur in two types-sequential access (data must access in a linear sequence) and direct access (data may access in any sequence).
- The most common sequential storage device is the hard disk drives, whereas direct-access devices include rotating drums, disks, CD-ROMs, and DVD-ROMs.
- It used as permanent storage of data in mainframes and supercomputers.
Virtual Memo :
- A computer can address more memory than the amount physically installed on the system.
- This extra memory is actually called virtual memory and it is a section of a hard disk that's set up to emulate the computer's RAM.
- The main visible advantage of this scheme is that programs can be larger than physical memory.
- Virtual memory serves two purposes.
- First, it allows us to extend the use of physical memory by using the disk.
- Second, it allows us to have memory protection because each virtual address is translated to a physical address.
