Computer Memory storage

1. Presentation on
Memory
And its Types
‫الرحیم‬ ‫الرحمن‬ ‫ہللا‬ ‫بسم‬

2. What is Memory
In computing,memory refers to the devices
used to store programs or data on a temporary
or permanent basis for use in a computer or
other digital electronic device.

3. Types of memory
1.Random Access Memory (RAM)
2.Read Only Memory (ROM)
3.Cache and Secondary Memory

4. Random access memory
A random-access memory device allows data items to be
read and written in roughly the same amount of time
regardless of the order in which data items are accessed.
Types of ram
1. Static RAM (SRAM)
2. Dynamic RAM (DRAM)

5. Static RAM
>.Fast and consume low power.
>.Expensive and has complex structure(6 transistor)so not
used for high capacity applications.
>.Fastest type of memory.
dynamic ram
>.Stores each bit of memory in capacitor in an integrated
circuit.
>.Real capacitor leaks charge so capacitors need to be
refreshed periodically.
>.Simple structure(1 capacitor and 1 transistor per bit) so
it has very high capacity.

6. RANDOM access memory
In Random Access Memory new contents can not be
added,it is used to store the instructions of routine
type,permanent in nature and used to control or
supervise the hardware.
Types of rom
1.Programmable ROM (PROM)
2.Erasable ROM (EROM)

7. PROGRAMMABLE ROM
>.Programmed to record the information using a facility
PROM-programmer.
>.Once the information is recorded it can not be changed.
>.You can buy a blank chip and have a PROM programmer
program it with your stuff.
Erasable rom
>.The cool thing about this one is that you can rewrite this
type of memory. To erase a previous program though, you
need to set it under some form of UV light for a specified
amount of time before being able to rewrite it.

8. Cache memory
>.Faster and expensive than RAM.
>.It improves the computer’s performance.
>.Processor can use it to store frequently accessed
data and programs instruction.
>.It is of two types
1.primary or L1 cache (inside processor)
2.secondary or L2 cache (in the motherboard or
near the microprocessor.

9. Cache memory

11. Secondary memory refers to storage devices, such
as hard drives and solid state drives. It may also
refer to removable storage media, such as USB
flash drives, CDs, and DVDs.
Unlike primary memory, secondary memory is not
accessed directly by the CPU.
Instead, data accessed from secondary memory is
first loaded into RAM and is then sent to the
processor.
Secondary Memory

12. CD – COMPACT DISK
DVD – DIGITAL VERSATILE DISC
– DIGITAL VIDEO DISC

13. Prepared By
Qureshi (ES-12)
KaimKhani (ES-16)
Rana (ES-62)