Computer Memory

COMPUTER MEMORY

Memory stands for storing capacity or storing power and every type of computer memory can be classified into two main categories (1. Primary Memory 2. Secondary Memory)

PRIMARY MEMORY
The primary memory is also known as volatile memory because of its store data and information for the temporary purpose.

PRIMARY  MEMORY - EXAMPLES

1. RAM (Random Access Memory) 

2. ROM (Read-only Memory) 

RAM (RANDOM ACCESS MEMORY)
RAM is also known as "Volatile Memory" because it is used to store data and instructions for the temporary purpose.

TYPES OF RAM
1. Dynamic RAM: The Static RAM require refreshing, therefore its content lost just after a short while (time).

2. Static RAM: These types of  RAMs does not need any refreshment, hence its store data as long system would be power on.

ROM (READ ONLY MEMORY)

ROM is also known as "Non Volatile Memory" because it can store data and instructions for the permanent purpose.

ROM - TYPES
1. PROM (Programmable Read Only Memory): These types of ROM can be written for one time.

2. EPROM (Erasable Programmable ROM): These types of ROM can write more than one time after erasing the previous data.

SECONDARY MEMORY

The Secondary memory is also known as Non-volatile Memory Or 'Auxiliary Memory', because of its store data permanently in the hard drive or in other secondary memory storing devices.

SECONDARY MEMORY - EXAMPLES

1.  HDD (Hard disk drive) also known as Magnetic Disk

2.  FDD (Floppy disk drive) also known as magnetic tape

3.  Pen drive, CDs (Compact Disk)

4.  DVD (Digital Video Disk)

OTHER TYPES MEMORY

CACHE MEMORY
Cache is the fastest memory among all types of memories and it exists between CPU and primary memory.

CACHE MEMORY FEATURES

1. More fastest than compare to any other memory

2. Complex to design.

3. Expensive

4. Very small size


VIRTUAL MEMORY
Virtual memory implemented by the operating system and this technique is used to access secondary memory's space as primary memory. 

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