What is the Full Form of CD/DVD?

What is the Full Form of CD/DVD ?

DVD - Digital Video Disk or Digital Versatile Disc

Digital Versatile Disc, or commonly known as Digital Video Disk is an optical disc storage media format that can be used for storing high capacity data like high quality movies and videos and even an operating system. It was developed in 1995 by 4 companies namely : Philips, Panasonic, Sony and Toshiba. 

A DVD is available in many variants, including :
4.7 GB (single-sided, single-layer)
8.5–8.7 GB (single-sided, double-layer)
9.4 GB (double-sided, single-layer)
17.08 GB (double-sided, double-layer)

Physical Dimension of a DVD
A Digital Video Disk comes in 2 dimensions : 12 cm (120 mm) and 8 cm (80 mm) diameter sizes. 120 mm is the most commonly used dimension for storing Movies, Operating systems and large software. 80 mm size is suitable for small devices like a video camera.

What is the Full Form of CD ?

CD - Compact Disc
Compact Disc is an optical disc used to store data including video, text, audio etc. in digital form. The Data is written to the CD using an optical device known as CD Writer which can be read through a similar device known as CD Drive.

Size & Capacity
Standard CDs have a diameter of 4.7 inch, 1.2 millimeters thick, made up of polycarbonate plastic and can hold data up 700 MBs. Compact Disc are far cheaper than HDD and easy to handle.

CD - Change Directory
Change Directory is a Disk Operating System (DOS) command used to change the directory (also known as a folder in a Computer System).