Page 42 - gyamfi series vol. 2

INFORMATION AND COMUNICATION TECHNOLOGY GYAMFI SERIES
(DVD) Digital Versatile Disk
CD-R:
As the name implies the CD- Recordable comes prerecorded
and information is
provided for the user to read without any alteration. They can
store up to 650MB or
700MB, 74 minutes or 80 minutes respectively.
Recordable CD-(CD-R): A ‘write- once’ optical storage technology that uses CD-R
drives to record data on CD-R discs. Once you have recorded data and write new
data as you please, you cannot ERASE the stored data or make any changes on
write over the disk again. The surface of a CD-R is usually silver- white in colour.
Rewritable CD-(CD-RW): a read/write optical storage technology that uses a CD-R
or CD-RW discs. You can erase the recorded data and write new once as you please.
The surface of a CD-RW is usually dark- brown in colour.

D.V.D or Digital Versatile Disk: It is high-density medium capable of storing 17
times the data on the normal CD.
ii. USB FLASH DRIVE: A small device used to store
information. USB flash drives plug
into computer USB ports so that you can copy information to or
from them making
it easy to share and transport information. It comes in various
storage capacities
120MG, 256MG, 512MG, 1Gig etc. An example is the Pen
drive.
iii. Flash memory cards: A device used by many digital cameras and mobile phones to store pictures
and videos. Flash memory cards store computer information such as
text pictures, and music and can be copied, erased and used many times.

NOTE:
Storage capacity is the amount of information that can be stored on a storage device.
Storage capacity is measured in bytes. A byte is a group of 8bits. A bit is a zero (0) or
one (1). The smallest unit of data the computer can take is Bit.
- 8bits ………………………………………..1bytes
-1024bytes………………………………… 1kilobyte (KB)
Note; 1024 bytes can be rounded to one thousand (1000) bytes for the sake of simplicity.
-1000KB ……………………………………. 1 Megabyte (MB) ‘Is roughly 1million bytes.’
-1000MB …………………………………… 1 Gigabyte (GB) ‘roughly 1billion bytes.’

-1000GB ……………………………………. 1 Terabyte.
Burning: is the process of writing or copying information onto a CD or D.V.D.
Ripping: is the process of coping information from a CD or DVD.
MP3: is a compressed audio format that has gained huge popularity. MP3 files can be
stored on any type of CD or DVD. Remember that MP3 is not a storage disk.
USES AND IMPORTANCE OF STORAGE DEVICES
1. They are used for making back-up copies of important information. Note: back-up
means copy of any information on a computer stored on storage devices.

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