Question

Difference between hard disk ,cd rom,dvd and pen drive

Answer 1

HARD DISK:- A hard disc drive, hard disc, hard drive or fixed disc is a data storage device that uses magnetic storage to store and retrieve digital information using one or more rigid rapidly rotating discs coated with magnetic material.......
CD ROM:- A CD ROM is a pre- pressed optical compact disc which contains data. The name is an acronym which stands for Compact Disc- Read Only Memory. Computers can read CD- ROMs, but cannot write to CD- ROMs, which are not writable or erasable.. ....
DVD:- DVD is a digital optical disc storage format invented and developed by Philips and Sony in 1995. The medium can store any kind of digital data and is widely used for software and other computer files......
PEN DRIVE:- A USB flash drive, also variously known as a thumb drive, pen drive, gig stick, jump drive, disc key, memory stick or USB memory, is a data storage device that includes flash memory with an integrated USB interface......


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Answer 2

The difference are as below :-

1) Hard disk : It is an electro mechanical data storage device. Information remains intact even after switching off the computer.

2) CD ROM : It is a pre-pressed optical compact disk that stores data. It stands for Compact Disk : Read Only Memory.

3) DVD : DVD stands for digital versatile disk. Some DVDs are formatted especially for video playback, while others may contain different types of data, such as software programs as well as computer files.

4) Pen Drive : Pen drive or USB flash drive is a portable memory device used to store information from any computer.