Memory and Storage Devices: Quick Notes for JKSSB - JKSSB Mock Test
If you are preparing for JKSSB exams, understanding memory and storage devices is essential for scoring well in the computer section. This guide explains types, examples, differences, and FAQs with simplified notes to help you grasp the concepts quickly.
What is Memory?
Memory in computers refers to the components that store data temporarily for immediate use by the CPU. It is volatile, meaning data is lost when the power is turned off. Memory is used to store running programs and processes, enabling the computer to function smoothly.
Types of Memory
- Primary Memory: Memory directly accessible by the CPU for processing data and instructions.
- Secondary Memory: Used for permanent storage of data and programs, but it is technically separate from "memory" and considered "storage." We will discuss storage in detail below.
Primary Memory Types
- RAM (Random Access Memory): Volatile memory used for temporarily storing data and instructions that the CPU needs while executing tasks.
- ROM (Read Only Memory): Non-volatile memory containing permanent instructions required for booting the system.
- Cache Memory: A small, high-speed memory located near the CPU, used for frequently accessed data to speed up processing.
- Registers: Small storage areas within the CPU used to store instructions and data temporarily during processing.
RAM: Details for JKSSB
RAM is of two main types:
- SRAM (Static RAM): Faster, more expensive, used for cache memory.
- DRAM (Dynamic RAM): Slower than SRAM, less expensive, used as the main system memory.
RAM is volatile, meaning it loses its data when the system is shut down.
ROM: Details for JKSSB
ROM stores critical instructions for booting the system and is non-volatile, retaining its contents even when the power is off.
Types of ROM include:
- PROM (Programmable ROM): Can be programmed once after manufacturing.
- EPROM (Erasable Programmable ROM): Can be erased by UV light and reprogrammed.
- EEPROM (Electrically Erasable Programmable ROM): Can be erased and reprogrammed using electrical signals.
What is Storage?
Storage devices are used for the long-term storage of data, files, software, and the operating system. They are non-volatile and retain data even when the system is turned off.
Types of Storage Devices
- Magnetic Storage Devices: Hard Disk Drives (HDD), Floppy Disks, Magnetic Tapes.
- Optical Storage Devices: CDs, DVDs, Blu-ray Discs.
- Solid State Storage Devices: Solid State Drives (SSD), USB Flash Drives, Memory Cards.
- Cloud Storage: Online storage provided over the internet, such as Google Drive, Dropbox.
Comparison: Memory vs Storage
| Feature | Memory | Storage |
|---|---|---|
| Volatility | Volatile (loses data when power off) | Non-volatile (retains data without power) |
| Speed | Faster | Slower compared to memory |
| Function | Stores data temporarily for CPU processing | Stores data permanently for later use |
| Examples | RAM, Cache, Registers | HDD, SSD, CD, USB Drive |
| Capacity | Usually smaller in size (GBs) | Larger in size (GBs to TBs) |
Importance of Memory and Storage for JKSSB Exams
Questions related to memory and storage devices are frequently asked in JKSSB computer sections. You may get direct questions like:
- Identify which among the following is a volatile memory.
- Differentiate between RAM and ROM.
- Which device is used for permanent storage?
- Give examples of optical storage devices.
Key Points to Remember for JKSSB
- Memory: Temporary, volatile, fast, limited capacity, CPU can directly access it.
- Storage: Permanent, non-volatile, slower than memory, larger capacity, used for long-term data storage.
- ROM is non-volatile, RAM is volatile.
- SSD is faster than HDD.
- Cache memory speeds up CPU operations.
Examples of Storage Devices for JKSSB
- Magnetic Storage: HDD, Floppy Disk.
- Optical Storage: CD, DVD.
- Flash Storage: USB Drives, Memory Cards.
- Cloud Storage: Google Drive, Dropbox.
Advantages of SSD over HDD
- Faster data access and boot time.
- No moving parts, so less risk of mechanical failure.
- Consumes less power.
- Silent operation.
Common MCQs on Memory and Storage for JKSSB
- Q1: Which memory retains data even when the computer is turned off?
Ans: ROM - Q2: Which of the following is an example of volatile memory?
Ans: RAM - Q3: Which device offers faster data access speeds, SSD or HDD?
Ans: SSD - Q4: What is the primary function of cache memory?
Ans: To speed up CPU operations by storing frequently accessed data. - Q5: What type of storage device is a DVD?
Ans: Optical Storage Device
FAQs for JKSSB Computer Section
Q1: What is the difference between memory and storage?
Memory stores data temporarily for quick CPU access, while storage retains data permanently for long-term use.
Q2: What is the use of ROM in computers?
ROM stores the bootloader and essential programs required to start the computer.
Q3: Is SSD better than HDD?
Yes, SSD is faster, more reliable, and consumes less power than HDD.
Q4: Which memory is faster, cache or RAM?
Cache memory is faster than RAM.
Q5: Name two cloud storage services.
Google Drive and Dropbox.
Conclusion
Mastering the concepts of memory and storage devices will help you tackle the computer awareness section of the JKSSB exams effectively. Focus on definitions, differences, examples, and frequently asked questions to boost your preparation.
For more JKSSB computer notes, mock tests, and MCQs, keep visiting JKSSB Mock Test regularly to enhance your preparation and stay ahead in your competitive journey.
