Primrary storage

2. GROUP MEMBERS
 GROUP LEADER
Salman Tariq
GROUP MEMBER
Luqman Butt
Hafiz Zeeshan
Abdul Islam
Ahmad Ali

3. STORAGE UNITS
 After completing this presentation. The students will be
able to know .
 What is the function of Ram and Rom and its uses .
 This presentation also describes the importence of the
storage unit.

4. STORAGE UNIT
 It is consists of two types
 Primary storage
 Secondary storage

5. PRIMARY STORAGE
 Primary storage also known as
main storage or memory
 It is also called main working area.
 It is volatile memory
 It is also contain on memory or cache memory
 Primary storage consists of two types.
 RAM
 ROM

6. RAM
 RAM stands for Random Access
Memory
 RAM is also called main
memory or primary storage
 RAM is a volatile memory
 RAM is used to store data and
instructions temporarily.

7. TYPES OF RAM
1. D-RAM
2. S-RAM

8. D-RAM
 DRAM stands for DYNAMIC RANDAM
ACCESS MEMORY
 DRAM is most commonly used technology
build RAM chips and consumes a lot of
power as data store in DRAM needs to be
refreshed periodically

9. S-RAM
 SRAM stands for STATIC
RANDAM ACCESS MEMORY
 S-RAM is faster than the D-
RAM but it is more expensive.
 Unlike D-RAM, the contents
of S-RAM do not needs to be
refreshed periodically

10. ROM
 ROM stands for READ ONLY
MEMORY
 It is a permanent storage area
 It contains start up instructions of
the computer and information
about its hardware device
 It is fixed on the motherboard
 ROM is non volatile

11. TYPES OF ROM
 Following are the types of rom.
1. PROM
2. EPROM
3. EEPROM

12. P-ROM
 This form of ROM is initially
blank.
 The user can write his on own
data/information on it by using
special device.
 Once the program is written on
PROM. It cannot be changed.
 This kind of ROM will be used
for storage data for a very long
period of time.

13. EP-ROM
 Like PROM, it is initially blank that
programme and data can be written
on it by the manufacturer or by the
user with special devices .
 Unlike PROM, a user by using special
device to erase data written on it .
 This kind of Rom is used to change
the old program and written new
program on it .

14. EEP-ROM
 This kind of ROM can be re
written by using electrical device.
 Data can be stored on EEPROM
can be easily modified.
 EEPROM can be very useful for
taking backup of data and for
keeping records that are operated
periodically.

15. MEMORY
 Memory consists of electronic chips.
 Memory stores instructions and
data, so that CPU can process them.
 It is the working space of the
computer.
 The main memory of the computer
consist of thousands and millions of
cells .

16. MEMORY UNIT
 The smallest unit of memory is called bit ( 0
or 1 )
 4 bits = 1 Nibble
 1 Byte = 8 bits
 1024 Bytes = 1KB = Kilo byte
 1024 Kilo Bytes = 1MB = Mega byte
 1024 Mega Bytes = 1GB = Giga byte

17. CACHE MEMORY
 SRAM technology is used to build
very fast memory inside a CPU
chip. This is known as cache
memory.
 Cache memory is very small as
compared to the computer
 It increases the performance of
the computer.

18. THIS PRESENTATION IS PRESENTED BY
♥♥♥HAFIZ GROUP♥♥♥
♥♥♥

19. ♥ IF YOU HAVE ANY
QUESTION ♥