Memories are the most important topic of ICT in Paper-1. In every shift of the recent exam, NTA asked questions from this section. So prepare thoroughly this part.
- A memory is just like the brain of a human.
- It stores data and instructions.
- Memory in a computer is the storage space in the computer where data and instructions are processed and given respectively.
- Small parts of memory are cells.
- Each location or cell has a unique address.
There are three types of Memory
- Cache Memory
- Primary Memory/Main Memory
- Secondary Memory
1. Cache Memory
- It is a high-speed semiconductor memory that speeds up the CPU.
- Between CPU and main memory, it acts as a buffer.
- Most frequently used data and program by CPU are held by cache memory.
- The parts of programs and data are transferred from disk to cache memory by the OS (Operating system), from where CPU (central processing unit) can access them.
- It is fast than main memory.
- As compared to main memory it consumes less access time.
- Cache memory is mainly used to store a program that is to b executed in a short period of time.
- Data is stored temporarily in it.
- Its memory holding capacity is limited.
- It is expensive than other memory.
2. Primary Memory (Main Memory)
- It holds only those instructions and data on which running computer is currently working.
- Due to its limited capacity when the power is switched off data is lost.
- Semiconductor devices are used to make up.
- Primary memories are not as fast as registers.
- All the instructions and data required to be processed resides in the main memory i.e primary memory.
- Primary memory can be divided into two subcategories: RAM and ROM
Characteristics of Main Memory
- These are called as semiconductor memories.
- It is called as the main memory.
- It is volatile memory.
- As the power is switched off data is lost.
- It is the working memory of the computer.
- It is fast than secondary memory.
- A computer cannot function without primary memory.
3. Secondary Memory
- This memory is also called as external memory.
- It is non-volatile.
- Secondary memory is slower than the primary memory.
- It is used for storing information and data permanently.
- CPU doesn't access these memories directly, instead, they are accessed via input-output routines.
- The contents of secondary memories are first transferred to the main memory, and then the CPU can access it.
- For example- DVD, CD-ROM, disk, etc.
Characteristics of Secondary Memory
- These are optical and magnetic memories.
- It is called as the backup memory.
- It is a non-volatile memory.
- It is used for storing data in a computer.
- A computer can function without secondary memory.
- It is slower than the primary memories.
- Even if the power is switched off data is permanently stored.
We hope you all understood about the memories in ICT for UGC NET Exam.
Thank you, Team gradeup.