ICT Lectures for DIT

1. Information & Communication
Technology (ICT)
Storage Devices
DIT Part 1
Lecture 8
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2. Storage Devices
• A storage device is any computing hardware
that is used for storing, porting and extracting
data files and objects.
• It can hold and store information both
temporarily and permanently, and can be
internal or external to a computer, server or
any similar computing device.
• A storage device may also be known as a
storage medium or storage media.
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3. Storage Devices
There are two different types of storage devices:
• Primary storage devices: Generally smaller in size, are
designed to hold data temporarily and are internal to
the computer.
• They have the fastest data access speed, and include
RAM and cache memory.
• Secondary storage devices: These usually have large
storage capacity, and they store data permanently.
• They can be both internal and external to the
computer, and they include the hard disk, compact disk
drive and USB storage device
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4. Primary Storage Devices
Computer ROM
• A good example of ROM in the computer is
the computer BIOS.
• Using a non-volatile storage is the only way to
begin the start up process for computers and
other devices that use a similar start up
process.
• ROM chips are also used in gaming system.
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6. Primary Storage Devices
Computer RAM
• RAM chips are also used in computers, as well
as other devices, to store information and run
programs on the computer because RAM is
one of the fastest types of memory in your
computer.
• For example, the Internet browser you are
using to read this page has been loaded into
memory and is running from memory.
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7. Primary Storage Devices
Computer RAM
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8. Primary Storage Devices
RAM & ROM
• There is one major difference between a ROM
and a RAM chip.
• A ROM chip is non-volatile storage and does not
require a constant source of power to retain
information stored on it.
• When power is lost or turned off, a ROM chip will
keep the information stored on it.
• In contrast, a RAM chip is volatile and requires a
constant source of power to retain information.
When power is lost or turned off, a RAM chip will
lose the information stored on it.
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9. Other differences between a ROM and
a RAM chip include
• A ROM chip is used primarily in the start up
process of a computer, whereas a RAM chip is
used in the normal operations of a computer
after starting up and loading the operating
system.
• Writing data to a ROM chip is a slow process,
whereas writing data to a RAM chip is a faster
process.
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10. Other differences between a ROM and
a RAM chip include
• A RAM chip can store multiple gigabytes (GB)
of data, up to 16 GB or more per chip.
• A ROM chip typically stores only several
megabytes (MB) of data, up to 4 MB or more
per chip.
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11. Secondary Storage
Hard DriveDisk
• A computer hard disk drive (HDD) is the
mechanism that controls the positioning, reading
and writing of the hard disk, which furnishes data
storage.
• A hard disk drive (HDD), hard disk or hard drive, is
something used by computers to store
information.
• The capacity of a hard drive is usually measured
in gigabytes (GB), however hard disc capacity can
also be measured in terabytes when the capacity
is over 1000 gigabytes.
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12. Hard Drives Types and Capacity Guide
Capacity
Digital Photos
(JPG)*
Digital Photos
(RAW)*
Songs
(MP3)*
Songs
(Uncompressed)*
Digital Video
(DV)*
DVD-Quality
Video*
HD Video*
16GB 3,200 330 4,000 400 1 6 1
32GB 6,400 660 8,000 800 2 12 3
64GB 12,000 1,330 16,000 1,600 4 24 7
128GB 25,000 2,660 32,000 3,200 9 49 15
256GB 51,000 5,330 64,000 6,400 19 98 30
500GB 100,000 10,000 125,000 12,500 38 190 60
1TB (1,000GB) 200,000 20,000 250,000 25,000 76 380 120
1.5TB 300,000 31,000 375,000 37,000 110 570 180
2TB 400,000 41,000 500,000 50,000 150 770 240
4TB 800,000 83,000 1,000,000 100,000 300 1540 480
6TB 1,200,000 125,000 1,500,000 150,000 460 2300 720
8TB 1,600,000 166,000 2,000,000 200,000 610 3080 960
12TB 2,400,000 250,000 3,000,000 300,000 920 4620 1440
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14. CD-ROM
• Stands for "Compact Disc Read-Only
Memory."
• A CD-ROM is a CD that can be read by a
computer with an optical drive.
• The "ROM" part of the term means the data
on the disc is "read-only," or cannot be altered
or erased. Because of this feature and their
large capacity, CD-ROMs are a great media
format for retail software.
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15. CD-ROM
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16. USB
• USB, short for Universal Serial Bus, is a standard type of
connection for many different kinds of devices.
• Generally, USB refers to the types of cables and
connectors used to connect these many types of
external devices to computers.
• USB was designed to standardize the connection of
computer peripherals (including keyboards, pointing
devices, digital cameras, printers, portable media
players, disk drives and network adapters) to personal
computers, both to communicate and to supply electric
power
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17. USB
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18. Assignment
– Magnetic Tape.
– Magnetic Drum.