UNIT 1 COMPUTER OPERATIONS AND FUNDAMENTALS LESSON …€¦ · • A secondary storage device is a...
Transcript of UNIT 1 COMPUTER OPERATIONS AND FUNDAMENTALS LESSON …€¦ · • A secondary storage device is a...
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1
UNIT 1
COMPUTER OPERATIONS AND
FUNDAMENTALS
LESSON 5:
Secondary Storage Devices
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What is a secondary storage device?
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A secondary storage device is a piece of hardware
used to store computer files permanently.
That is files are not lost even when the computer is
shut down.
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Secondary storage device
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External storage device
Backing storage device
Auxiliary storage device
Secondary
storage
device
Secondary storage devices are also known as:
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Examples of secondary storage devices
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Hard Disk Drives Solid-State Drives Pen drives
Memory cards Optical discs
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Features of secondary storage devices
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Hard Disk Drive (HDD)
• It has several moving
parts.
• It provides very fast
read/write access.
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Features of secondary storage devices
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Hard Disk Drive (HDD)
• It is found inside desktop and
laptop computers.
• It has a very large storage
capacity. (measured in GB or
TB)
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Features of secondary storage devices
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Solid-State Drive (SSD)
• A mass storage device.
• It has no moving parts.
• It can also be purchased in a
portable format. (external
hard drive)
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Features of secondary storage devices
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Solid-State Drive (SSD)
• provides faster access than HDD
• does not make noise
• uses less electricity than HDD
• is more expensive than HDD
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Features of secondary storage devices
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Pen drive (USB flash drive)
• A small storage device which connects to
the computer through a USB port.
• It uses solid-state technology.
• It is suitable for transferring files between
computers.
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Features of secondary storage devices
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Pen drive (USB flash drive)
• It can also be used as a backup device.
• Its price varies according to its storage capacity.
(16GB, 32GB, 64GB, 128GB, 265GB … 1TB, 2TB)
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Features of secondary storage devices
Memory card
•A small flat flash drive.
• It is commonly used
with digital cameras,
mobile phones and
music players.
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Features of secondary storage devices
Memory card
• It has a very high
storage capacity.
• Its price varies
according to its storage capacity.
• Since it is very small,
it can be misplaced or lost easily.
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Features of secondary storage devices
Optical disc
A flat and circular storage
device which can be
written to and read from
using a laser beam.
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Examples of optical discs
Compact Disc (CD)
• Storage capacity of 700 MB.
• Can be used to store
multimedia files.
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Examples of optical discs
Digital Versatile Disc (DVD)
• Storage capacity of 4.7 GB.
• Can be used to store very
large multimedia files.
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Examples of optical discs
Blu-ray Disc (BD)
• Storage capacity of > 50 GB.
• Can be used to store several
hours of very high quality
video.
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Features of optical discs
Optical discs can be classified as
1. Read Only Memory (ROM)
2. Recordable (R)
3. Re-Writable (RW)
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Features of optical discs
Read Only Memory (ROM) Discs
• Data on ROM discs is pre-recorded and new
data cannot be added.
• Example: Buying a computer game on disc.
▪ CD-ROM
▪ DVD-ROM
▪ BD-ROM
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Features of optical discs
Recordable Discs
• Data can be written onto recordable discs but
cannot be changed/modified or erased.
▪ CD-R
▪ DVD-R
▪ BD-R
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Features of optical discs
Re-Writable Discs
• Data on re-writable discs can be written, erased
and rewritten several times.
▪ CD-RW
▪ DVD-RW
▪ BD-RW
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Quick Test
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TRUE FALSE
measured in Gigabytes or Terabytes.
1.A hard disk has a very large storage capacity.
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Quick Test
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TRUE
The storage size of a hard disk is
measured in Gigabytes or Terabytes.
1.A hard disk has a very large storage capacity.
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Quick Test
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TRUE FALSE
ROM.
2. New files can be stored on a CD-ROM.
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Quick Test
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FALSE
CD-ROM is Read Only, that is new data
cannot be added to it.
2. New files can be stored on a CD-ROM.
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Quick Test
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TRUE FALSE
3. A DVD has a smaller storage capacity
compared to a CD.
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Quick Test
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A CD can store only 700 MB.
A DVD has a storage capacity of 4.7 GB
which is much higher than that of a CD
3. A CD has a smaller storage capacity
compared to a DVD.
TRUE
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Quick Test
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TRUE FALSE
A memory card is used as a storage
4. A memory card is used to store
photographs taken with a mobile phone.
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Quick Test
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TRUE
A memory card is small and flat, suitable to
be used as a storage medium in mobile
phones.
4. A memory card is used to store
photographs taken with a mobile phone.
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Quick Test
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TRUE FALSE
5. A Blu-ray disc is suitable for storing high
quality video files.
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Quick Test
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TRUE
A Blu-ray disc has a very high storage
capacity and is suitable for storing very large
multimedia files.
5. A Blu-ray disc is suitable for storing high
quality video files.
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Recap
• A secondary storage device is a piece of
hardware used to store computer files for later
use.
• Examples of secondary storage devices
include hard disk drives, solid-state drives, pen
drives, memory cards and optical discs.
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Recap
• Each type of storage device uses a different
technology for reading and writing data.
• Choosing a suitable storage device depends on
the type of file to be saved.
• The price of storage devices varies according to
their storage size.
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End of Lesson