This document defines and describes different types of computer storage devices. It begins by defining storage devices and noting there are two main types: primary and secondary storage. Primary storage, like RAM, is directly accessible by the CPU while secondary storage, like hard disks, is not directly accessible and stores data non-volatilely. The document goes on to provide examples of different secondary storage devices, grouping them as magnetic (hard disks, floppy disks, magnetic tape) or optical (CDs, DVDs, Blu-ray discs). It presents these storage devices diagrammatically and concludes by posing some questions about storage devices.

1. IT
(INTRODUCTION TO BUSINESS)
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‫عليكم‬ ‫اسالم‬
PEACE BE UPON YOU

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CONTENTS
1. DEFINITION OF STORAGE DEVICE.
2. TYPES OF STORAGE DEVICES.
3. DEFINITION OF PRIMARY STORAGE DEVICE.
4. DEFINITION OF SECONDARY STORAGE DEVICE.
5. TYPES OF SECONDARY STORAGE DEVICES.

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WHAT IS STORAGE DEVICES?
DEFINITION:
• Storage device is also referred
as digital storage, storage
media, storage medium.
• A storage device is any
hardware which is capable of
carrying information,
information can be
permanently or temporarily for
later use.

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TYPES OF STORAGE DEVICES
THERE ARE TWO TYPES OF STORAGE DEVICES
1. Primary / Internal Memory
2. Secondary / External Memory
Qno.2. What is primary storage devices?
1. Primary Storage Device/ Internal & Main
Memory:
DEFINITION:
Primary Storage is the area in a computer in
which data is stored for quick access by the computer’s
processor. It stores data that is directly accessible by the
computer’s CPU.
The term random access memory (RAM) and
memory are often as synonyms for Primary or Main storage

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TYPES INCLUDES:
• RAM( random access memory )
• ROM (read only memory)
• EPROM( erasable programmable ROM )
RAM ROM EPROM

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TYPES OF STORAGE DEVICES
Qno.3.What is secondary storage device ?
• Secondary Storage Device/ External
Memory:
DEFINITION :
Secondary Storage Device alternatively referred to as
external memory, secondary memory and auxiliary
storage.
Not directly accessible by the CPU, Non-volatile
memory-device that holds data until it is deleted or
overwritten.

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FLASH
DRIVE
MEMORY CARDS
HARD DISK
FLOPPY DISK
OPTICAL DEVICE
CD-ROM, DVD -R, CD-R,
CD-RW, Blu-ray disc
MAGNETIC TAPE
MAGNETIC TAPE
SECONDARY STORAGE DEVICES
MEMORY STORAGEMAGNETIC STORAGE

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SECONDARY STORAGE DEVICE
DIRECT
ACCESS
MEMORY
STORAGE
MEMORY
CARD
FLASH
DRIVE
OPTICAL
DISK
DVD
CD-
RW
WORM
(CD-R)
CD-
ROM
MAGNETIC
DISK
HARD
DISKS
WINCHESTER
DISK
DISK
PACK
ZIP
DISK
FLOPPY
DISK
SEQUENTIAL
ACCESS
MAGNETIC
TAPE

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1. Why so many different storage devices?
2. What is storage location?
3. Why storage is needed in the computer system?
4. What storage devices are used today?
5. What storage devices has the large capacity?

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