The document discusses different types of memory devices used in computers. It describes how hard disk drives store programs and RAM temporarily stores programs for quick CPU access. RAM is divided into static RAM (SRAM) and dynamic RAM (DRAM). SRAM retains data as long as power is applied while DRAM is cheaper and smaller. The document also lists other memory devices like ROM, EPROM, EEPROM, magnetic tape, flash memory, cloud storage and punch cards.

2. Members
 Awais Abbasi
 Shalim Akhter
 Hassam Amin
 Shehroz Khalid

3. Topic
Memory Devices

4. Introduction
 In a computer, all the programs are stored in hard disk
drive.
 Whenever you access any program, it is temporarily
stored in the memory called RAM(random access
memory) so that the CPU accesses any software
quickly.

5. Hard Disk
 A hard disk drive (HDD), hard disk, hard drive or fixed
disk is a data storage device that uses magnetic
storage to store and retrieve digital information using
one or more rigid rapidly rotating disks (platters)
coated with magnetic material.

6. RAM
 A RAM constitutes the internal memory of the CPU
for storing data, program and program result. It is
read/write memory. It is called random access memory
(RAM).

7. Types of RAM
 Static RAM (SRAM)
 Dynamic RAM (DRAM

8. STATIC RAM
 The word static indicates that the memory retains its
contents as long as power remains applied. However,
data is lost when the power gets down due to volatile
nature.
 SRAM is short from of STATIC RAM

9. DYNAMIC RAM
 DRAM is used for most system memory because it is
cheap and small. All DRAMs are made up of memory
cells. These cells are composed of one capacitor and
one transistor.

10. Latest types of Memory Devices
 MROM (Masked ROM)
 PROM (Programmable Read Only Memory)
 EPROM (Erasable and Programmable Read Only
Memory)
 EEPROM (Electrically Erasable and Programmable
Read Only Memory)

11. Continue…
 Magnetic tape.
 Flash memory (USB memory sticks)
 Cloud Storage
 Punch card