Memory:-
Memory is a storage area where data and information can be stores.
Types of memory:-
Memory is classified into 2 types
- Primary Memory
- Secondary Memory
1. Primary Memory:
It refers to the computer’s main memory. Data will be stored temporarily in the primary
memory. All data will be stored in chips.
Memory chips are of 2 types
- RAM chips
- ROM chips
1. RAM chips
- It stands for Random Access Memory
- It holds information temporarily
- Data stored in RAM will be lost if power is turned off
- Both reading and writing can take place in RAM
2. ROM Chips
- It stands for Read Only Memory
- Only reading can take place in ROM
- It holds information permanently
- Data stored in ROM will not be lost
2. Secondary Memory:-
It refers to the secondary storage devices. It is used to store data permanently.
Types of Storage devices :-
It is classified into 3 types
- Optical disk
- Magnetic Disk
- Magnetic tapes
1.Optical disk :-
An Optical disk is an electronic data storage medium that can be read and write
using a low powered laser beam.
Ex. CD, DVD
2. Magnetic Disk:-
It is a thin circular metal plate coated on both sides with a magnetic material.
It is
classified in to two types.
- Floppy Disk
- Hard Disk
1. Floppy Disk:-
- It is a random storage medium
- Data is stored in tracks and sectors
- Each sector holds 512 bytes of data
2. Hard Disk :-
- It is made up of metal plate coated magnetic material on both sides
- It is the direct access storage medium
- Disk pack moves simultaneously in same direction and at equal speed.
- Each disk consists of number of invisible concentric circles called tracks.
- The number of tracks and sectors on a disk is known as its format.
3. Magnetic Tapes :-
- It is similar to cassette tapes and can be accessed serially.
- Data are stored in frames Each record on a tape is separated by blank spaces called inter record gaps.
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