Inside this;; Definition how to measure memory types of memory Presented by Utsav Mandaviya

1. Computer
MemoryBy Utsav Mandaviya

2. What Is Memory ?
• “memory” means the place where we
have to store anything, this is very
essential part of human being just like this
memory is also very important for
computer system because in computer
system we have to store some data or
information and for storing these items we
need some memory or a space.
• So That’s Why can say that memory is very
important part of computer system.
• Computer memory is any physical device
capable of storing information
temporarily or permanently.

3. How To Measure Memory ?
• There are various units which are
used to measure computer
memory.
• Bit - Smallest units of
computer memory
• Byte - 8 Bit = 1 Byte
• Kilobyte - 1024 Byte = 1 KB
• Megabyte - 1024 KB = 1 MB
• Gigabyte - 1024 MB = 1 GB
• Terabyte - 1024 GB = 1 TB

4. Classification Of
Memory:-
Memory
Primary
Memory
Secondary
Memory

5. 1. Primary Memory:-
• Primary memory is also known as “main
memory” or “internal memory” which is
located in the mother board of system or
as we say which is directly connected to
the CPU.
• It is the place where only little bit of data
are stored either by manufacturer or by
user.
• This is further divided into Two parts:-
1. RAM
2. ROM

6. RAM :-
• Known as “Random Access Memory”.
• A temporary storage that can be read from or written
into by the user.
• RAM need power or electricity to work when the
computer power is turned off then the all data in it will
be erase automatically.
• It is Volatile Memory.
RAM
Dynamic
RAM
Static RAM

7. Dynamic RAM:-
• DRAM stands for Dynamic RAM.
• Relatively slower and low cost memory.
• Used for main memory.
• Contents are constantly refreshed 1000 times
per second
• Access time 60 – 70 nanoseconds

8. Static RAM:-
• SRAM stands for static RAM.
• Characterized by high speed and high cost.
• Use six transistors to store data.
• Access time 60 – 70 nanoseconds
• Can accept one command and transfer one word
of data per clock cycle.

9. ROM:-
• Know as “Read Only Memory”.
• These are Non-Volatile in nature.
• This memory is mainly used by our
computer when we just turn on.
• It contains BIOS of system.
ROM
PROM EPROM EEPROM

10. • PROM:- A programmable read-only memory is a form of digital
memory where the setting of each bit is locked by a fuse or
antifuse. It is one type of ROM. The data in them are permanent
and cannot be changed
• EPROM:-An EPROM, or erasable programmable read-only
memory, is a type of programmable read-only memory chip
that retains its data when its power supply is switched off.
Computer memory that can retrieve stored data after a power
supply has been turned off and back on is called non-volatile.
• EEPROM:- EEPROM (also E2PROM) stands for electrically
erasable programmable read-only memory and is a type of non-
volatile memory used in computers, integrated
in microcontrollers for smart cards and remote keyless systems,
and other electronic devices to store relatively small amounts of
data but allowing individual bytes to be erased and

11. Secondary Memory:-
• Much larger in capacity but
slower than main memory.
• Permanent storage of data and
instruction.
• Example: Hard disk, Solid State
Drive, CD, Floppy etc.

12. • Hard Disk:- A hard disk drive (HDD),
hard disk, hard drive, or fixed disk is
an electro-mechanical data storage
device that stores and retrieves
digital data using magnetic storage
and one or more rigid rapidly
rotating platters coated with
magnetic material.
• Solid sate drive:-A solid-state drive
(SSD) is a new generation of
storage device used in computers.
SSDs replace traditional mechanical
hard disks by using flash-based

13. • DVD:- Stands for "Digital Versatile
Disc." A DVD is a type of optical
media used for storing digital data. It
is the same size as a CD, but has a
larger storage capacity. Some DVDs
are formatted specifically for video
playback, while others may contain
different types of data, such as
software programs and computer
files.
• CD Disk:- Compact disc is a digital
optical disc data storage format that
was co-developed by Philips and

14. • Floppy disk:-A floppy disk or floppy
diskette is a type of disk storage
composed of a thin and flexible disk
of a magnetic storage medium in a
square or nearly square plastic
enclosure lined with a fabric that
removes dust particles from the
spinning disk. Floppy disks are read
from and written to by a floppy disk
drive.

15. Flash Drive ( Pen Drive):-
• Compact device of the size of a pen
comes in various shapes and stylish
design.
• One can read, write, copy, delete and
move data from the computer’s hard
disk drive to flash drive or from the
flash drive to the hard disk drive.
• Storage capacity are 8 MB, 16 MB,
64 MB, 128 MB, 256 MB,512 MB,1
GB, 2 GB, 4 GB, and 8GB.

16. Thank You