This document discusses different types of storage devices used in computing. It identifies primary storage devices as those that are part of the computer like RAM and ROM, which are needed for the computer to function. Secondary storage devices include removable media like hard drives, optical disks, magnetic disks, and USB drives that can store information both internally and externally. The document defines different types of optical disks such as CDs, DVDs, and Blu-ray disks, and their uses for permanent or temporary storage. It also discusses the differences between volatile and non-volatile memory.
9. HUMAN COMPUTER
Input Lesson Data
CPU
Process Brain
Output Learning Audio/Visual
Brain/ paper Primary/Secondary
Storage
Storage
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10. What is a Storage Devices?
It is a hardware device capable
of storing information
A term used to describe any location
where information can be held
permanently or temporarily for later use.
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11. What are the two types of
Storage Devices?
Primary Storage
Secondary Storage
* Hard Drive
* Off-line Storage
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12. What are the two types of
Storage Devices?
Primary Storage
Secondary Storage
* Hard Drive
* Off-line Storage
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13. Primary Storage Devices
Alternatively referred to as internal
memory ,main memory, primary storage is a storage
location that holds memory for short periods of times
while the computer is on. For example, computer RAM
and cache are both examples of a primary storage
device. This storage is the fastest memory in your
computer and is used to store data while it's being used.
For example, when you open a program data is moved
from the secondary storage into the primary storage.
RAM and ROM are the Primary Storage of the
Computer
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14. Primary Storage Devices
• ROM – • RAM –
• Read Only Memory. • Random Access
• Permanent memory. Memory.
• Non-volatile memory. • Volatile memory.
• Can’t be edited. • Temporary memory.
• Stores important • Holds data up to saving.
program from system • Bring required
software, regarding programs when user
functioning of opens a file.
computer. (Booting)
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16. Secondary Storage Device
Alternatively referred to
as external memory and auxiliary
storage, secondary storage is a
storage medium that holds
information until it is deleted or
overwritten regardless if the computer
has power.
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17. Hard Disc
• Hard disc – Essential part of a computer.
• Useful to store system, all application software,
drivers, data and information.
Internal hard Disk External hard Disk
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18. Secondary Storage Device
Offline Storage Device:
This are magnetic device used
to store information which can be
detached from the computer unit.
Examples :
1.Optical Disc
2. Magnetic Device
3. Mass Storage Device
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19. Secondary Storage
Optical Disk
1.Optical Disc
An optical disc or optical
disk is any disc that is read by light.
Examples:
Compact Disc (CD) Digital Video Disc Blu Ray (BD)
(DVD)
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20. OPTICAL DEVICES- CD/DVD/BRD
Type Write Edit Re burn
R- Recordable Yes No Limited
RW- Rewritable. Yes Yes Yes
ROM – Read Only No No No
Memory.
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21. Use of Optical Devices
• CD/DVD/BRD (R) – To store data
permanently.
• CD/DVD/BRD (RW) – to store data
temporarily, to carry data.
• CD/DVD/BRD (ROM) – use to store
software, educational program, movies,
drivers, games etc.
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22. Secondary Storage Device
Offline Storage
Offline Storage Device:
This are magnetic device used
to store information which can be
detached from the computer unit.
Examples :
1.Optical Disc
2. Magnetic Device
3. Mass Storage Device
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23. Secondary Storage Devices
Offline Storage Device
2. Magnetic Device-stores data in as much
the same way as music is recorder on casette
tapes or stereo record.
•Example:
•Floppy disk
•Alternatively referred to as a floppy, a floppy diskwas originally created
in 1967 by IBM to help have an alternative to buying hard drives that
were extremely expensive at the time and were not thought of as
something to be used with a standard computer
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24. Secondary Storage Devices
Offline Storage Device
3. Mass Storage Device
Storage Device that can be detached from the
computer.
Example:
USB- Universal Serial Bus
Memory Card
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26. Summary
Storage Device are device we used to store
process information. They may be primary or
secondary storage devices
Primary storage devices are those storage
which are part of the computer. Computers will not
be able to run without it. Primary memory are the
RAM and ROM.
Secondary storage devices are those storage
which can be taken out of the computer. They may
be an optical disk, magnetic disc or mass storage
device.
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27. Assessment
1.What is a storage devices?
2.What are the two types of storage device?
3. What are the different type of optical disk?
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28. Quiz Proper
A.Give the meaning of the following:
1. VCD
2. DVD
3. BD
4. USB
5. ROM
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29. volatile
Volatile memory is
memory that loses its
contents when the computer
or hardware device loses
power.
Non-volatile memory is
memory that keeps its
contents even if the power is
lost
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