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Tech Fact
First hard disk was introduced by Seagate in 1980 which could 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. The optical discs are not
used commonly now a days.
Compact Disc (CD)
Compact Disc (CD) is an external storage device. It can hold upto 700 MB
of data. The CD drive reads information stored on a compact disc. 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 CD-RW.
CD
Digital Versatile Disc or Digital Video Disc (DVD)
The DVD is almost similar to a CD, even the working is also similar. 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. 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
Blu-ray Disc
Blu-ray disc is an optical disc. It is used for storing a large amount of data.
The main difference between DVDs and Blu-ray discs is that storage capacity
of Blu-ray disc is higher than that of the DVD.
Blu-ray Disc
Flash Drive
Flash memory, 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.
Pen Drive
Pen Drive acts as a portable hard drive and is easy to use as it is small and
can be carried in a pocket and plugged into any computer with a USB drive.
Pen drive has storage capacity of upto 1TB. Pen drive
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