SS2 First Term Computer Studies Lesson Note – Memory Unit II

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WEEK 4

TOPIC:  MEMORY UNIT (Cont’d)

CONTENT: 

1. Differences between Primary and Secondary memory
2. Units of Storage
3. Conversion from one unit to the other
4. Comparison of auxiliary storage devices

 

Sub-Topic 1: DIFFERENCES BETWEEN PRIMARY AND SECONDARY MEMORY

As earlier discussed, Computer memory can be categorized into primary and secondary memory. Both memories vary in the speed, cost and capacity. The table below shows the clear differences between both memories; 

PRIMARY MEMORY	SECONDARY MEMORY
It is considered as a main memory that is accessed directly by the computer	It is considered as an additional or additional memory not directly accessed by the CPU
The memory devices used for primary memory are semiconductor memories	The memory devices are magnetic and optical memories
These memories are also called internal memory	These memories are also called external memory
It is a type of temporary memory	It can be used as a permanent memory
The sizes of primary memory ranges between 512MB to 16GB RAMs	Secondary memories ranges between 80GB to 4TB Hard disk drives
It is directly accessed by the processor in a random manner	It is not directly accessed by the processor, input/output channels are used to access the secondary memory
It is embedded with two types of memory technologies – RAM and ROM	It is embedded in the form of mass storage devices like pen drive, CD, DVD, etc
It is classified as volatile (RAM) and non-volatile (ROM) in nature	It is generally non-volatile in nature
Data Processing speed is faster	Data Processing speed is somehow slow, not as fast as primary memory
It is costlier than the secondary memory devices	It is cheaper than primary memory
They are connected to the computer through ‘slots’	They are connected to the computer through drives and cables

Sub-Topic 2: UNITS OF STORAGE

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