Storage Device - AMAN ..

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AMAN MOHAMMAD ATIF

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STORAGE DEVICE

TOPIC

1. Introduction 2. Types of Storage Device3. Primary Storage Device 4. Types of Primary Storage Device5. Secondary Storage Device 6. Types of Secondary Storage Device

CONTENTS

1. Hardware device2. Holds information or store data 3. Process data or information

INTRODUCTION

What is Storage Device

There are mainly two types :-

1. Primary Storage Device2. Secondary Storage Device

TYPES OF STORAGE DEVICE

1. Temporary Storage Device,2. Volatile in most cases,3. Looses data when power is shut off…

What is primary storage device ?

There are mainly three types :-

1. RAM 2. ROM3. CACHE MEMORY..

TYPES OF PRIMARY DEVICE

1. Random Access Memory2. An integrated circuit made up of

millions of transistor and capacitor. 3. Volatile 4. Two type - Static RAM [SRAM] Dynamic RAM [DRAM]

What is RAM ?

DRAM1. Volatile memory2. it requires stored information refreshed.. SRAM3. Volatile memory4. it never require refresh.

What is DRAM and SRAM ?

1. Read only memory2. non- volatile3. Three types – PROM , EPROM ,

EEPROM..

What is ROM ?

PROM Programmable Read Only Memory EPROM

Erasable Programmable ROM

EEPROM

Electrically Erasable Programmable ROM

1. Speed up the way application work2. called microprocessor3. fast memory 4. more expensive then RAM

What is Cache memory?

1. Permanent Storage Device,2. non-volatile,3. Doesn’t loose data when computer is turned off..

What is Secondary Device?

1. It is readable or writable

2. It refers movable and backup storage

3. It is permanent until changed by user..

Secondary storage characteristics

There are mainly three types:-

1. Magnetic Disks2. Optical Disks3. Magnetic Tapes..

TYPES OF SECONDARY DEVICE

1. Consist of magnetically coated disks2. Two types:- Hard Disk Drive, Floppy Disk..

What is Magnetic Disks?

1. Invented in 1950s.,2. Non-volatile,3. store data or information4. Use thicker, metallic platters for storage5. Large capacity

Hard Disk Drive

Parts of HDD

Hard disk Packs

Diskettes Flexible disk and Floppies The plastic disk inside the diskette cover is

flexible Portable storage media Floppy disk drives (FDD)

Disk surface to represent ones and zeroes. Characters are represented by positive + and –

charges using ASCII code.

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Floppy Disks

Floppy Disk

High capacity Known as a floppy-disk cartridge Require special disk drives Three well known types

◦ Zip disks (Iomega) 100MB, 250MB, 750MB ◦ HiFD disks (Sony) 200MB, 720MB, read and store data on 1.44MB disk

◦ SuperDisks (Imation) 240MB, 120MB

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Types of Floppies

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Zip disks (Iomega)

SuperDisks (Imation)

HiFD disks (Sony)

Compact Permanent storage Optical disk use reflected light. The 1s and 0s are represented by flat areas

called lands and bumpy areas called pits. Two common types

◦ CD ( 650 MB to 1GB)◦ DVD ( 4.7 GB to 17 GB)

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Optical Disks

Optical format From 650 MB to 1 GB capacity Rotation speeds vary It determines how fast data can be transferred from the CD24X or 24- speed CD drive can transfer 3.6 MB per second. Types

◦ Read only: CD-ROM◦ Write once: CD-R◦ Rewriteable: CD-RW◦ Picture CDs and Photo CDs

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Compact Disc

Digital Versatile Disk or Digital Video Disk (DVD)

Similar to CDs, but can store more data Types

◦ Read only◦ Write once◦ Rewritable

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Digital Versatile Disc

Solid-state storage

Internet hard drives

Magnetic tape

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Other Types of Secondary Storage

New standard in storage Blu-Ray

◦ New disks use blue laser light instead of the red laser light used in traditional CD players

◦ Disks may ultimately hold Over 30GB on one-sided disks Over 50GB on two-sided disks

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A Look to the FutureBlu-Ray Technology

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Please ask the question very frankly with us…

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KHUDA HAFIZ