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Fun First hard disk was introduced by Seagate in 1980 which could
Fact!
hold 5 MB data.
Optical Disc
An optical disc is an electronic data storage medium that can be used to write and
read using a low-powered laser beam. there are three types of optical discs: CD,
DVD and Blu-ray. An optical disc generally has a longer lifespan than a magnetic disk. COMputer MeMOry
Compact Disc (CD)
The CD drive reads information stored on a compact disc (CD). CD is
an external storage device. It can hold upto 700 MB of data. CD drive
is usually connected inside the Cpu box but can also be connected
using a uSB port. there are three types of CDs: CD-rOM, CD-r, and 9
9
CD-rW. CD
Digital Versatile Disc or Digital Video Disc (DVD)
DVDs are now widely used in computers. They have now become
a popular medium for storing information and video. the DVD is
almost similar to a CD, even the working is also similar. DVDs come in
single-layer and dual-layer formats. A single-layer DVD can hold up
to 4.7 GB of data, while a dual-layer DVD can store up to 8.5 GB. DVD
the only difference is that it can hold more information than a CD. DVDs are widely
used for storing and viewing movies and other data.
Blu-ray Disc
Blu-ray disc is an optical disc. It is used for storing a large amount
of data and playing videos. the main difference between DVDs and
Blu-ray discs is that storage capacity of blue-ray disc is higher
than that of the DVD.
Blu-ray Disc
Flash Drive
The Flash Drive is a small portable data storage device integrated with a uSB
(universal Serial Bus) connector. Flash Drive, also known as flash storage, is a type of
non-volatile memory. It is used for easy and fast information storage in computers,
digital cameras and home video game consoles. Some of the devices based of flash
memory are pen drive, memory card, and solid state drive.

